refactor: remove exact cross-layer css duplicates

app/ARCHITECTURE.md

@@ -30,8 +30,9 @@ background scheduler
   `backend/application.py` and `backend/bootstrap/`.
 - `backend/bootstrap/` owns process configuration, dependency construction, startup, and
   shared input/display-format contracts. It does not own feature behavior.
-- `backend/http/` owns common authentication, request IDs, responses, static delivery, and
+- `backend/http/` owns common authentication, request IDs, JSON/NDJSON responses, static
-  error normalization. Feature-specific transport handlers live beside their feature.
+  delivery, streaming connection lifecycle, and error normalization. Feature-specific
+  transport handlers live beside their feature.
   Exact POST endpoints that only delegate to one of those handlers use the explicit maps in
   `backend/application.py`; endpoints with path parameters, body handling, or special error
   semantics remain visible control flow in `RequestHandler`.

app/backend/application.py

@@ -128,14 +128,19 @@ class DashboardService(
             profile_supplier=self._resolved_llm_profile,
         )
         self.screener.ensure_builtin_strategies()
-        self._background_stop = threading.Event()
+
-        self._background_thread = self.jobs.start_scheduler(
+    def start_background_jobs(self) -> threading.Thread:
+        return self.jobs.start_scheduler(
             self._background_refresh_tick,
-            self._background_stop,
             interval_seconds=5,
             initial_delay_seconds=3,
         )
 
+    def stop_background_jobs(self, timeout_seconds: float = 5) -> bool:
+        scheduler_stopped = self.jobs.stop_scheduler(timeout_seconds)
+        workers_stopped = self.jobs.wait_for_idle(timeout_seconds)
+        return scheduler_stopped and workers_stopped
+
 
     def _load_system_credentials(self, environment: dict[str, str]) -> dict[str, Any]:
         encrypted = self.database.get_system_setting("credentials")
@@ -472,38 +477,6 @@ class DashboardService(
             **self.database.status(),
         }
 
-
-
-
-
-
-    @staticmethod
-    def _ifind_field(row: dict[str, Any], tokens: tuple[str, ...]) -> Any:
-        for key, value in row.items():
-            label = str(key or "")
-            if any(token.casefold() == label.casefold() for token in tokens):
-                return value
-        for key, value in row.items():
-            label = str(key or "")
-            if any(token in label for token in tokens):
-                return value
-        return None
-
-    @classmethod
-    def _ifind_row_code(cls, row: dict[str, Any]) -> str:
-        value = cls._ifind_field(row, ("股票代码", "证券代码", "代码", "thscode"))
-        match = re.search(r"(?<!\d)(\d{6})(?!\d)", str(value or ""))
-        if match:
-            return match.group(1)
-        for value in row.values():
-            match = re.search(r"(?<!\d)(\d{6})\.(?:SH|SZ|BJ)(?![A-Z])", str(value or ""), re.I)
-            if match:
-                return match.group(1)
-        return ""
-
-
-
-
 SERVICE = DashboardService()
 
 
@@ -1020,16 +993,6 @@ class RequestHandler(
             return
         self.send_json({"error": "Not found"}, HTTPStatus.NOT_FOUND)
 
-
-
-    def _write_stream_event(self, payload: dict[str, Any]) -> None:
-        self.wfile.write(
-            (json.dumps(payload, ensure_ascii=False, separators=(",", ":")) + "\n").encode("utf-8")
-        )
-        self.wfile.flush()
-
-
-
     def save_reason(self) -> None:
         try:
             body = self.read_json_body()

app/backend/bootstrap/runtime.py

@@ -16,12 +16,13 @@ def main(handler_class: type[Any] | None = None, service: Any | None = None) ->
     parser.add_argument("--port", type=int, default=8765)
     args = parser.parse_args()
     server = ThreadingHTTPServer((args.host, args.port), handler_class)
+    try:
+        service.start_background_jobs()
         print(f"Xiaobai Review Web is running at http://{args.host}:{args.port}")
         print("Press Ctrl+C to stop.")
-    try:
         server.serve_forever()
     except KeyboardInterrupt:
         pass
     finally:
-        service._background_stop.set()
+        service.stop_background_jobs()
         server.server_close()

app/backend/features/heaven/repository.py

@@ -7,6 +7,35 @@ from typing import Any
 
 
 class HeavenRepositoryMixin:
+    def list_sector_phase_overrides(self) -> dict[str, str]:
+        with self.connect() as connection:
+            rows = connection.execute(
+                "SELECT name, element FROM sector_phase_overrides ORDER BY updated_at DESC, name"
+            ).fetchall()
+        return {row["name"]: row["element"] for row in rows}
+
+    def save_sector_phase_override(self, name: str, element: str) -> None:
+        now = datetime.now().astimezone().isoformat(timespec="seconds")
+        with self.connect() as connection:
+            connection.execute(
+                """
+                INSERT INTO sector_phase_overrides (name, element, updated_at)
+                VALUES (?, ?, ?)
+                ON CONFLICT(name) DO UPDATE SET
+                    element = excluded.element,
+                    updated_at = excluded.updated_at
+                """,
+                (name, element, now),
+            )
+
+    def delete_sector_phase_override(self, name: str) -> bool:
+        with self.connect() as connection:
+            cursor = connection.execute(
+                "DELETE FROM sector_phase_overrides WHERE name = ?",
+                (name,),
+            )
+            return cursor.rowcount > 0
+
     @staticmethod
     def _heaven_reading_dict(row: sqlite3.Row | None) -> dict[str, Any] | None:
         if not row:

app/backend/features/heaven/service.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import copy
 import json
 import re
+import secrets
 from datetime import date, datetime, timedelta
 from typing import Any
 

app/backend/features/mentor/http.py

@@ -14,19 +14,4 @@ class MentorHttpMixin:
         except (ValueError, json.JSONDecodeError) as exc:
             self.send_json({"error": str(exc)}, HTTPStatus.BAD_REQUEST)
             return
-        self.send_response(HTTPStatus.OK)
+        self.send_ndjson_stream(stream, (ValueError, MentorAgentError))
-        self.send_header("Content-Type", "application/x-ndjson; charset=utf-8")
-        self.send_header("Cache-Control", "no-cache, no-transform")
-        self.send_header("X-Accel-Buffering", "no")
-        self.send_header("Connection", "close")
-        self.end_headers()
-        try:
-            for event in stream:
-                self._write_stream_event(event)
-            self._write_stream_event({"type": "done"})
-        except (ValueError, MentorAgentError) as exc:
-            self._write_stream_event({"type": "error", "error": str(exc)})
-        except (BrokenPipeError, ConnectionResetError):
-            pass
-        finally:
-            self.close_connection = True

app/backend/features/pools/service.py

@@ -117,6 +117,30 @@ class PoolServiceMixin:
         finally:
             self._ifind_event_lock.release()
 
+    @staticmethod
+    def _ifind_field(row: dict[str, Any], tokens: tuple[str, ...]) -> Any:
+        for key, value in row.items():
+            label = str(key or "")
+            if any(token.casefold() == label.casefold() for token in tokens):
+                return value
+        for key, value in row.items():
+            label = str(key or "")
+            if any(token in label for token in tokens):
+                return value
+        return None
+
+    @classmethod
+    def _ifind_row_code(cls, row: dict[str, Any]) -> str:
+        value = cls._ifind_field(row, ("股票代码", "证券代码", "代码", "thscode"))
+        match = re.search(r"(?<!\d)(\d{6})(?!\d)", str(value or ""))
+        if match:
+            return match.group(1)
+        for value in row.values():
+            match = re.search(r"(?<!\d)(\d{6})\.(?:SH|SZ|BJ)(?![A-Z])", str(value or ""), re.I)
+            if match:
+                return match.group(1)
+        return ""
+
     @staticmethod
     def _normalize_ifind_event_time(value: Any) -> str:
         text = str(value or "").strip()

app/backend/features/review/http.py

@@ -26,22 +26,8 @@ class ReviewHttpMixin:
         except (ValueError, json.JSONDecodeError) as exc:
             self.send_json({"error": str(exc)}, HTTPStatus.BAD_REQUEST)
             return
-        self.send_response(HTTPStatus.OK)
+        events = ({"type": "delta", "content": chunk} for chunk in stream)
-        self.send_header("Content-Type", "application/x-ndjson; charset=utf-8")
+        self.send_ndjson_stream(events, (ValueError, ReviewAssistantError))
-        self.send_header("Cache-Control", "no-cache, no-transform")
-        self.send_header("X-Accel-Buffering", "no")
-        self.send_header("Connection", "close")
-        self.end_headers()
-        try:
-            for chunk in stream:
-                self._write_stream_event({"type": "delta", "content": chunk})
-            self._write_stream_event({"type": "done"})
-        except (ValueError, ReviewAssistantError) as exc:
-            self._write_stream_event({"type": "error", "error": str(exc)})
-        except (BrokenPipeError, ConnectionResetError):
-            pass
-        finally:
-            self.close_connection = True
 
     def save_watchlist(self) -> None:
         try:

app/backend/http/handler.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import json
 import mimetypes
 import secrets
+from collections.abc import Iterable
 from http import HTTPStatus
 from http.cookies import SimpleCookie
 from typing import Any
@@ -142,5 +143,33 @@ class HttpTransportMixin:
         self.end_headers()
         self.wfile.write(content)
 
+    def _write_stream_event(self, payload: dict[str, Any]) -> None:
+        self.wfile.write(
+            (json.dumps(payload, ensure_ascii=False, separators=(",", ":")) + "\n").encode("utf-8")
+        )
+        self.wfile.flush()
+
+    def send_ndjson_stream(
+        self,
+        events: Iterable[dict[str, Any]],
+        error_types: tuple[type[Exception], ...],
+    ) -> None:
+        self.send_response(HTTPStatus.OK)
+        self.send_header("Content-Type", "application/x-ndjson; charset=utf-8")
+        self.send_header("Cache-Control", "no-cache, no-transform")
+        self.send_header("X-Accel-Buffering", "no")
+        self.send_header("Connection", "close")
+        self.end_headers()
+        try:
+            for event in events:
+                self._write_stream_event(event)
+            self._write_stream_event({"type": "done"})
+        except error_types as exc:
+            self._write_stream_event({"type": "error", "error": str(exc)})
+        except (BrokenPipeError, ConnectionResetError):
+            pass
+        finally:
+            self.close_connection = True
+
     def log_message(self, format_string: str, *args: Any) -> None:
         print(f"[{self.log_date_time_string()}] {format_string % args}")

app/backend/jobs/runner.py

@@ -18,6 +18,9 @@ class InProcessJobRunner:
         self.repository = repository
         self._locks: dict[str, threading.Lock] = {}
         self._locks_guard = threading.Lock()
+        self._scheduler_guard = threading.Lock()
+        self._scheduler_stop = threading.Event()
+        self._scheduler_thread: threading.Thread | None = None
 
     def submit(
         self, job_id: str, idempotency_key: str, action: JobAction,
@@ -52,28 +55,43 @@ class InProcessJobRunner:
         return True
 
     def start_scheduler(
-        self, callback: Callable[[], None], stop_event: threading.Event,
+        self, callback: Callable[[], None], interval_seconds: float,
-        interval_seconds: float, initial_delay_seconds: float = 0,
+        initial_delay_seconds: float = 0,
     ) -> threading.Thread:
+        with self._scheduler_guard:
+            current = self._scheduler_thread
+            if current is not None and current.is_alive():
+                return current
+            self._scheduler_stop.clear()
+
             def schedule_loop() -> None:
-            if stop_event.wait(initial_delay_seconds):
+                if self._scheduler_stop.wait(initial_delay_seconds):
                     return
-            while not stop_event.is_set():
+                while not self._scheduler_stop.is_set():
                     try:
                         callback()
                     except Exception:
-                    # Submitted jobs persist their own failures; the scheduler must stay alive.
+                        # Submitted jobs persist failures; the scheduler must stay alive.
                         pass
-                stop_event.wait(interval_seconds)
+                    self._scheduler_stop.wait(interval_seconds)
 
             thread = threading.Thread(
                 target=schedule_loop,
                 name="background-job-scheduler",
                 daemon=True,
             )
+            self._scheduler_thread = thread
             thread.start()
             return thread
 
+    def stop_scheduler(self, timeout_seconds: float = 5) -> bool:
+        with self._scheduler_guard:
+            thread = self._scheduler_thread
+            self._scheduler_stop.set()
+            if thread is not None and thread is not threading.current_thread():
+                thread.join(max(0, timeout_seconds))
+            return thread is None or not thread.is_alive()
+
     def wait_for_idle(self, timeout_seconds: float = 5) -> bool:
         deadline = time.monotonic() + max(0, timeout_seconds)
         while time.monotonic() <= deadline:

app/backend/llm/service.py

@@ -4,6 +4,7 @@ from datetime import datetime, timezone
 from typing import Any
 from urllib.parse import urlparse
 
+from backend.bootstrap.config import validate_text
 from backend.features.screener.compiler import LLMCompilerError, test_llm_connection
 
 

app/config/architecture-inventory.json

@@ -287,6 +287,16 @@
       "path": "backend/llm/transport.py"
     }
   ],
+  "http_transport": [
+    {
+      "function": "send_json",
+      "path": "backend/http/handler.py"
+    },
+    {
+      "function": "send_ndjson_stream",
+      "path": "backend/http/handler.py"
+    }
+  ],
   "css_layers": [
     "/shared/tokens.css?v=20260729-1",
     "/styles/styles.css",
@@ -299,13 +309,13 @@
   "code_hotspots": [
     {
       "path": "frontend/styles/styles.css",
-      "bytes": 361776,
+      "bytes": 361501,
-      "lines": 15465
+      "lines": 15450
     },
     {
       "path": "frontend/styles/redesign-v2.css",
-      "bytes": 263539,
+      "bytes": 263467,
-      "lines": 8570
+      "lines": 8569
     },
     {
       "path": "frontend/index.html",
@@ -334,8 +344,8 @@
     },
     {
       "path": "frontend/styles/renovation.css",
-      "bytes": 83949,
+      "bytes": 83812,
-      "lines": 1553
+      "lines": 1550
     },
     {
       "path": "frontend/pages/heaven/page.css",
@@ -344,8 +354,8 @@
     },
     {
       "path": "backend/features/heaven/service.py",
-      "bytes": 63123,
+      "bytes": 63138,
-      "lines": 1303
+      "lines": 1304
     },
     {
       "path": "backend/features/market/insights.py",
@@ -364,8 +374,8 @@
     },
     {
       "path": "backend/application.py",
-      "bytes": 48749,
+      "bytes": 47769,
-      "lines": 1129
+      "lines": 1092
     },
     {
       "path": "frontend/styles/theme.css",
@@ -374,8 +384,8 @@
     },
     {
       "path": "database.py",
-      "bytes": 33284,
+      "bytes": 32073,
-      "lines": 746
+      "lines": 716
     }
   ]
 }

app/database.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import json
 import sqlite3
-from datetime import datetime, timezone
+from datetime import datetime
 from pathlib import Path
 from typing import Any
 
@@ -665,36 +665,6 @@ class ReviewDatabase(
             )
             MigrationRunner().apply(connection, MIGRATIONS)
 
-
-
-    def list_sector_phase_overrides(self) -> dict[str, str]:
-        with self.connect() as connection:
-            rows = connection.execute(
-                "SELECT name, element FROM sector_phase_overrides ORDER BY updated_at DESC, name"
-            ).fetchall()
-        return {row["name"]: row["element"] for row in rows}
-
-    def save_sector_phase_override(self, name: str, element: str) -> None:
-        now = datetime.now().astimezone().isoformat(timespec="seconds")
-        with self.connect() as connection:
-            connection.execute(
-                """
-                INSERT INTO sector_phase_overrides (name, element, updated_at)
-                VALUES (?, ?, ?)
-                ON CONFLICT(name) DO UPDATE SET
-                    element = excluded.element,
-                    updated_at = excluded.updated_at
-                """,
-                (name, element, now),
-            )
-
-    def delete_sector_phase_override(self, name: str) -> bool:
-        with self.connect() as connection:
-            cursor = connection.execute(
-                "DELETE FROM sector_phase_overrides WHERE name = ?",
-                (name,),
-            )
-            return cursor.rowcount > 0
     def list_wencai_saved_queries(
         self, user_id: int, limit: int = 30
     ) -> list[dict[str, Any]]:

app/frontend/styles/redesign-v2.css

@@ -4318,7 +4318,6 @@ body.sidebar-collapsed .status-bar { left: 64px; }
 #dragonView .dragon-operation-table .dragon-col-direction { width: 72px; }
 #dragonView .dragon-operation-table .dragon-col-number { width: 82px; }
 #dragonView .dragon-operation-table .dragon-col-seat { width: 190px; }
-#dragonView .dragon-operation-table .dragon-col-reason { width: auto; }
 #dragonView .dragon-operation-table :is(th, td).row-number { padding-inline: 8px; text-align: center; }
 #dragonView .dragon-operation-table td.stock-code { font-variant-numeric: tabular-nums; }
 #dragonView .dragon-operation-table thead th { position: sticky; top: 0; z-index: 2; background: #fafbfc; }

app/frontend/styles/renovation.css

@@ -127,7 +127,6 @@ body.sidebar-collapsed .app-main { margin-left: 0; }
   background: transparent;
 }
 
-.overview-strip .sentiment-block { padding-left: 0; }
 .overview-strip .sentiment-gauge { width: 26px; height: 26px; flex: 0 0 26px; border-width: 2px; font-size: 10px; }
 .overview-strip .sentiment-text { font-size: 12px; white-space: nowrap; }
 .overview-strip .metric-label { color: var(--text-tertiary); font-size: 10.5px; white-space: nowrap; }
@@ -160,8 +159,6 @@ body.sidebar-collapsed .app-main { margin-left: 0; }
 .overview-strip[data-overview-expanded="true"] .metric { min-height: 76px; align-items: flex-start; justify-content: center; flex-direction: column; gap: 4px; }
 .overview-strip[data-overview-expanded="true"] .sentiment-block { flex-direction: row; justify-content: flex-start; align-items: center; }
 .overview-strip[data-overview-expanded="true"] .sentiment-gauge { width: 48px; height: 48px; flex-basis: 48px; font-size: 13px; }
-.overview-strip[data-overview-expanded="true"] .metric-value { font-size: 18px; }
-
 /* Page frame and shared information architecture. */
 .workspace-view,
 body[data-active-view="screenerView"] .workspace-view,

app/frontend/styles/styles.css

@@ -666,10 +666,6 @@ time {
   box-shadow: var(--shadow-soft);
 }
 
-.workspace-view.active-view {
-  display: block;
-}
-
 .workspace-view.active-view.view-entering {
   animation: view-enter var(--motion-medium) var(--ease-out) both;
 }
@@ -4745,10 +4741,6 @@ textarea {
   outline-color: rgba(29, 101, 193, 0.48);
 }
 
-body.sidebar-collapsed {
-  grid-template-columns: 64px minmax(0, 1fr);
-}
-
 body.sidebar-collapsed .module-nav {
   width: 64px;
   padding-right: 7px;
@@ -5369,8 +5361,6 @@ body.sidebar-collapsed .sidebar-collapse-button .lucide {
   border-right: 1px solid var(--border);
   transition: background-color var(--motion-medium) ease, opacity var(--motion-medium) ease;
 }
-.rotation-day:last-child { border-right: 0; }
-
 .rotation-day header { display: grid; gap: 2px; margin-bottom: 8px; }
 .rotation-day header time { font-size: 12px; font-weight: 700; }
 .rotation-day header span { color: var(--text-secondary); font-size: 10px; }
@@ -7130,11 +7120,6 @@ body.sidebar-collapsed .sidebar-collapse-button .lucide {
   box-shadow: 1px 0 0 var(--border);
 }
 
-#screenerView .probability-value strong,
-#screenerView .probability-value small {
-  display: block;
-}
-
 #screenerView .probability-value small {
   margin-top: 3px;
   color: var(--text-secondary);

app/tests/e2e/app-shell.spec.js

@@ -1803,6 +1803,30 @@ test("heart breathing prepares once then contracts on each exhale", async ({ pag
   await expect(page.locator(".heart-breath-ripple span").first()).toHaveCSS("transition-duration", "4s");
 });
 
+test("stylesheet layers do not repeat identical top-level rules", async ({ page }) => {
+  await mockApplication(page, session("admin", true));
+  await page.goto("/index.html");
+
+  const duplicates = await page.evaluate(() => {
+    const occurrences = new Map();
+    for (const sheet of Array.from(document.styleSheets)) {
+      const href = sheet.href ? new URL(sheet.href).pathname : "inline";
+      for (const rule of Array.from(sheet.cssRules || [])) {
+        if (typeof rule.selectorText !== "string" || !rule.style) continue;
+        const key = `${rule.selectorText}\u0000${rule.style.cssText}`;
+        const rows = occurrences.get(key) || [];
+        rows.push(href);
+        occurrences.set(key, rows);
+      }
+    }
+    return Array.from(occurrences.entries())
+      .filter(([, paths]) => new Set(paths).size > 1)
+      .map(([rule, paths]) => ({ rule, paths }));
+  });
+
+  expect(duplicates).toEqual([]);
+});
+
 test("mobile shell stays within the viewport", async ({ page }) => {
   await page.setViewportSize({ width: 375, height: 812 });
   await mockApplication(page, session("user", true));

app/tests/preservation_helpers.py

@@ -29,6 +29,34 @@ RETIRED_FRONTEND_SOURCE_RANGES = (
 )
 AUDITED_FRONTEND_SOURCE_LINE_COUNT = 9283
 
+# CR-12 removes only declarations that are repeated verbatim by a later
+# stylesheet layer under the same top-level cascade context. Keeping the exact
+# source fragments here makes every other byte of the accepted CSS baseline a
+# preservation requirement.
+AUDITED_CSS_RETIREMENTS = {
+    "styles.css": (
+        ".workspace-view.active-view {\n  display: block;\n}\n\n",
+        "body.sidebar-collapsed {\n  grid-template-columns: 64px minmax(0, 1fr);\n}\n\n",
+        ".rotation-day:last-child { border-right: 0; }\n\n",
+        (
+            "#screenerView .probability-value strong,\n"
+            "#screenerView .probability-value small {\n"
+            "  display: block;\n"
+            "}\n\n"
+        ),
+    ),
+    "renovation.css": (
+        ".overview-strip .sentiment-block { padding-left: 0; }\n",
+        (
+            '.overview-strip[data-overview-expanded="true"] .metric-value '
+            "{ font-size: 18px; }\n\n"
+        ),
+    ),
+    "redesign-v2.css": (
+        "#dragonView .dragon-operation-table .dragon-col-reason { width: auto; }\n",
+    ),
+}
+
 
 def sha256(path: Path) -> str:
     return hashlib.sha256(path.read_bytes()).hexdigest()
@@ -123,6 +151,17 @@ def assert_moved_asset_matches(
     frontend_relative: str | None = None,
 ) -> None:
     target_relative = frontend_relative or original_relative
+    if original_relative in AUDITED_CSS_RETIREMENTS:
+        original = (ORIGINAL_STATIC / original_relative).read_text(encoding="utf-8")
+        for retired in AUDITED_CSS_RETIREMENTS[original_relative]:
+            testcase.assertEqual(original.count(retired), 1, retired)
+            original = original.replace(retired, "", 1)
+        testcase.assertEqual(
+            (FRONTEND_ROOT / target_relative).read_text(encoding="utf-8"),
+            original,
+            original_relative,
+        )
+        return
     testcase.assertEqual(
         sha256(FRONTEND_ROOT / target_relative),
         sha256(ORIGINAL_STATIC / original_relative),

app/tests/test_background_lifecycle.py

@@ -0,0 +1,65 @@
+from __future__ import annotations
+
+import ast
+import sys
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from backend.bootstrap import runtime
+
+
+class BackgroundLifecycleTests(unittest.TestCase):
+    def test_service_construction_does_not_start_the_scheduler(self) -> None:
+        source = (Path(__file__).parents[1] / "backend" / "application.py").read_text(
+            encoding="utf-8"
+        )
+        tree = ast.parse(source)
+        service_class = next(
+            node for node in tree.body
+            if isinstance(node, ast.ClassDef) and node.name == "DashboardService"
+        )
+        constructor = next(
+            node for node in service_class.body
+            if isinstance(node, ast.FunctionDef) and node.name == "__init__"
+        )
+        called_methods = {
+            node.func.attr for node in ast.walk(constructor)
+            if isinstance(node, ast.Call) and isinstance(node.func, ast.Attribute)
+        }
+        self.assertNotIn("start_scheduler", called_methods)
+
+    def test_runtime_starts_jobs_after_bind_and_stops_before_close(self) -> None:
+        events: list[str] = []
+
+        class Service:
+            def start_background_jobs(self) -> None:
+                events.append("start-jobs")
+
+            def stop_background_jobs(self) -> None:
+                events.append("stop-jobs")
+
+        class Server:
+            def __init__(self, address: tuple[str, int], handler: object) -> None:
+                events.append("bind")
+
+            def serve_forever(self) -> None:
+                events.append("serve")
+                raise KeyboardInterrupt
+
+            def server_close(self) -> None:
+                events.append("close")
+
+        with (
+            patch.object(runtime, "ThreadingHTTPServer", Server),
+            patch.object(sys, "argv", ["server.py", "--port", "8797"]),
+        ):
+            runtime.main(object, Service())
+
+        self.assertEqual(
+            events, ["bind", "start-jobs", "serve", "stop-jobs", "close"]
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_heaven_readings.py

@@ -124,6 +124,50 @@ class HeavenReadingTests(unittest.TestCase):
             len(self.database.list_heaven_readings(self.owner["id"], "fortune")), 1
         )
 
+    def test_trend_interpretation_saves_successful_agent_result(self):
+        service = DashboardService.__new__(DashboardService)
+        service.database = self.database
+        service._request_context = threading.local()
+        service._request_context.user_id = self.owner["id"]
+        setup = {
+            "trade_date": "20260723",
+            "chart": {
+                "available": True,
+                "sector": "银行",
+                "stock": {"code": "000001", "name": "平安银行"},
+                "hexagram": {
+                    "name": "中孚",
+                    "lines": [],
+                    "transformed": {"name": "小畜"},
+                },
+                "movement": {},
+            },
+        }
+
+        with patch.object(service, "heaven_setup", return_value=setup), patch.object(
+            service,
+            "_call_heaven_agent",
+            return_value=(
+                {"answer": "完整的解势结果", "model": "test", "latency_ms": 1},
+                "primary",
+            ),
+        ):
+            result = service.heaven_interpret(
+                {
+                    "mode": "trend",
+                    "trade_date": "2026-07-23",
+                    "stock_code": "000001",
+                }
+            )
+
+        self.assertFalse(result["reused"])
+        self.assertEqual(result["answer"], "完整的解势结果")
+        self.assertEqual(result["reading"]["subject"], "000001 平安银行")
+        self.assertEqual(
+            self.database.list_heaven_readings(self.owner["id"], "trend")[0]["answer"],
+            "完整的解势结果",
+        )
+
 
 if __name__ == "__main__":
     unittest.main()

app/tests/test_http_streaming.py

@@ -0,0 +1,85 @@
+from __future__ import annotations
+
+import io
+import json
+import unittest
+
+from backend.http.handler import HttpTransportMixin
+
+
+class StreamError(RuntimeError):
+    pass
+
+
+class TransportStub(HttpTransportMixin):
+    def __init__(self) -> None:
+        self.statuses: list[int] = []
+        self.response_headers: list[tuple[str, str]] = []
+        self.wfile = io.BytesIO()
+        self.close_connection = False
+
+    def send_response(self, status: int) -> None:
+        self.statuses.append(int(status))
+
+    def send_header(self, name: str, value: str) -> None:
+        self.response_headers.append((name, value))
+
+    def end_headers(self) -> None:
+        pass
+
+
+class HttpStreamingTests(unittest.TestCase):
+    def test_stream_transport_preserves_headers_events_and_completion(self) -> None:
+        handler = TransportStub()
+        handler.send_ndjson_stream(
+            ({"type": "delta", "content": value} for value in ("甲", "乙")),
+            (StreamError,),
+        )
+
+        self.assertEqual(handler.statuses, [200])
+        self.assertEqual(
+            dict(handler.response_headers),
+            {
+                "Content-Type": "application/x-ndjson; charset=utf-8",
+                "Cache-Control": "no-cache, no-transform",
+                "X-Accel-Buffering": "no",
+                "Connection": "close",
+            },
+        )
+        events = [
+            json.loads(line)
+            for line in handler.wfile.getvalue().decode("utf-8").splitlines()
+        ]
+        self.assertEqual(
+            events,
+            [
+                {"type": "delta", "content": "甲"},
+                {"type": "delta", "content": "乙"},
+                {"type": "done"},
+            ],
+        )
+        self.assertTrue(handler.close_connection)
+
+    def test_stream_transport_preserves_feature_error_event(self) -> None:
+        def events():
+            yield {"type": "delta", "content": "partial"}
+            raise StreamError("stream failed")
+
+        handler = TransportStub()
+        handler.send_ndjson_stream(events(), (StreamError,))
+        payloads = [
+            json.loads(line)
+            for line in handler.wfile.getvalue().decode("utf-8").splitlines()
+        ]
+        self.assertEqual(
+            payloads,
+            [
+                {"type": "delta", "content": "partial"},
+                {"type": "error", "error": "stream failed"},
+            ],
+        )
+        self.assertTrue(handler.close_connection)
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_job_runner.py

@@ -68,6 +68,29 @@ class JobRunnerTests(unittest.TestCase):
         )
         self.assertEqual(self.repository.recent(1)[0]["status"], "failed")
 
+    def test_scheduler_start_is_idempotent_and_stop_waits_for_exit(self) -> None:
+        first = self.runner.start_scheduler(
+            lambda: None, interval_seconds=60, initial_delay_seconds=60
+        )
+        second = self.runner.start_scheduler(
+            lambda: None, interval_seconds=60, initial_delay_seconds=60
+        )
+        self.assertIs(first, second)
+        self.assertTrue(first.is_alive())
+        self.assertTrue(self.runner.stop_scheduler())
+        self.assertFalse(first.is_alive())
+
+    def test_scheduler_can_restart_after_an_orderly_stop(self) -> None:
+        first = self.runner.start_scheduler(
+            lambda: None, interval_seconds=60, initial_delay_seconds=60
+        )
+        self.assertTrue(self.runner.stop_scheduler())
+        second = self.runner.start_scheduler(
+            lambda: None, interval_seconds=60, initial_delay_seconds=60
+        )
+        self.assertIsNot(first, second)
+        self.assertTrue(self.runner.stop_scheduler())
+
 
 if __name__ == "__main__":
     unittest.main()

app/tests/test_llm_gateway.py

@@ -1,8 +1,10 @@
 from __future__ import annotations
 
 import unittest
+from unittest.mock import patch
 
 from backend.llm import LLMGateway, LLMGatewayError
+from backend.llm.service import LLMServiceMixin
 
 
 class ProviderFailure(RuntimeError):
@@ -113,6 +115,31 @@ class LLMGatewayTests(unittest.TestCase):
         with self.assertRaisesRegex(LLMGatewayError, "额度已用完"):
             gateway.call("mentor", "mentor-v1", lambda model: "unused", (ProviderFailure,))
 
+    def test_saved_system_model_can_reach_the_connection_probe(self) -> None:
+        service = LLMServiceMixin()
+        service._system_credentials = {
+            "llm_models": [
+                {
+                    "id": "primary-model",
+                    "name": "主模型",
+                    "api_key": "secret",
+                    "base_url": "https://model.example/v1",
+                    "model": "model-name",
+                }
+            ]
+        }
+        service.llm_gateway = self.gateway()
+        expected = {"ok": True, "reply": "OK"}
+        with patch(
+            "backend.llm.service.test_llm_connection", return_value=expected
+        ) as connection_probe:
+            result = service.test_system_llm_profile("primary-model", {})
+
+        self.assertEqual(result, expected)
+        connection_probe.assert_called_once_with(
+            "secret", "https://model.example/v1", "model-name"
+        )
+
 
 if __name__ == "__main__":
     unittest.main()

app/tests/test_preservation_slice_accounts.py

@@ -40,6 +40,8 @@ class AccountSliceStructureTests(unittest.TestCase):
             "require_access",
             "serve_static",
             "send_json",
+            "_write_stream_event",
+            "send_ndjson_stream",
         ):
             self.assertNotIn(method, RequestHandler.__dict__)
             self.assertIn(method, HttpTransportMixin.__dict__)

app/tests/test_preservation_slice_frontend.py

@@ -44,7 +44,7 @@ class FrontendPreservationSliceTests(unittest.TestCase):
             (ORIGINAL_STATIC / "index.html").read_text(encoding="utf-8"),
         )
 
-    def test_complete_stylesheet_stack_is_byte_identical_after_relocation(self) -> None:
+    def test_stylesheet_stack_matches_baseline_after_audited_retirements(self) -> None:
         for original, migrated in (
             ("shared/tokens.css", "shared/tokens.css"),
             ("styles.css", "styles/styles.css"),

app/tests/test_preservation_slice_heaven.py

@@ -38,6 +38,9 @@ HEAVEN_SERVICE_METHODS = {
 }
 
 HEAVEN_REPOSITORY_METHODS = {
+    "list_sector_phase_overrides",
+    "save_sector_phase_override",
+    "delete_sector_phase_override",
     "_heaven_reading_dict",
     "save_heaven_reading",
     "list_heaven_readings",

app/tests/test_preservation_slice_sentiment_pools.py

@@ -29,6 +29,8 @@ POOL_METHODS = {
     "_apply_reason_overrides",
     "_schedule_ifind_event_enrichment",
     "_refresh_ifind_event_enrichment",
+    "_ifind_field",
+    "_ifind_row_code",
     "_normalize_ifind_event_time",
     "_merge_ifind_event_enrichment",
 }

app/tools/build_architecture_inventory.py

@@ -179,6 +179,10 @@ def build() -> dict[str, Any]:
             {"function": "chat_completion", "path": "backend/llm/transport.py"},
             {"function": "stream_chat_completion", "path": "backend/llm/transport.py"},
         ],
+        "http_transport": [
+            {"function": "send_json", "path": "backend/http/handler.py"},
+            {"function": "send_ndjson_stream", "path": "backend/http/handler.py"},
+        ],
         "css_layers": css_layers(html),
         "code_hotspots": code_hotspots(),
     }

app/tools/run_preservation_runtime.py

@@ -32,16 +32,21 @@ def main() -> None:
     from server import RequestHandler, SERVICE
 
     server = ThreadingHTTPServer(("127.0.0.1", args.port), RequestHandler)
+    try:
+        if hasattr(SERVICE, "start_background_jobs"):
+            SERVICE.start_background_jobs()
         print(
             f"Preservation runtime is running at http://127.0.0.1:{args.port} "
             f"with database {SERVICE.database.path}",
             flush=True,
         )
-    try:
         server.serve_forever()
     except KeyboardInterrupt:
         pass
     finally:
+        if hasattr(SERVICE, "stop_background_jobs"):
+            SERVICE.stop_background_jobs()
+        else:
             SERVICE._background_stop.set()
         server.server_close()
 

docs/governance/code-reduction.md

@@ -25,6 +25,11 @@
 | CR-05 | 根级兼容入口 | 正式后端仍有五处通过迁移兼容模块反向导入规范实现 | 正式代码改用规范路径；兼容入口只服务原公开导入契约 | 已完成 |
 | CR-06 | 紧凑日期显示 | Tushare与选股引擎各保留一份完全相同的`YYYYMMDD`显示转换 | 由`bootstrap/config.py`拥有唯一格式策略，消费者保留原局部别名 | 已完成 |
 | CR-07 | 数据Provider组装 | 核查网关、容器和业务服务是否重复创建外部数据客户端 | 固化唯一创建位置及兼容例外，不改数据源语义 | 已完成 |
+| CR-08 | NDJSON流式传输 | 问师与复盘助手重复维护响应头、事件写入、完成、断线及关闭流程 | HTTP共享层拥有唯一流式连接生命周期 | 已完成 |
+| CR-09 | 应用服务门面 | 两个仅服务股池iFinD补全的方法仍错位在全局`DashboardService` | 原函数体机械归位到`PoolServiceMixin` | 已完成 |
+| CR-10 | Repository所有权 | 五行行业阶段覆盖的三项持久化方法仍错位在根级数据库门面 | 原函数体机械归位到问天Repository，兼容数据继续保留 | 已完成 |
+| CR-11 | 后台任务生命周期 | 导入应用即启动调度线程，启动早于端口绑定，停止只置位但不等待 | 运行时显式启停，每个Runner只拥有一个可等待的调度线程 | 已完成 |
+| CR-12 | CSS跨层精确重复 | 七层样式保留多次视觉改造形成的重复顶层规则，前层声明被后层逐字覆盖 | 只删除能够由CSSOM证明完全重复的前层规则，并建立浏览器级重复门禁 | 已完成 |
 
 ## CR-01验收口径
 
@@ -185,6 +190,137 @@
 本批基线为`xiaobai-reduction-06-date-formatting-20260801`；检查点为
 `xiaobai-reduction-07-provider-ownership-20260801`。
 
+## CR-08验收口径
+
+- 只合并NDJSON响应头、事件序列化、完成事件、业务错误事件、客户端断线和连接关闭这些传输行为。
+- 问师继续直接输出原事件字典；复盘助手继续把文本分片包装为`delta/content`事件。
+- 两个功能各自的业务异常类型、请求体错误状态码、错误正文和流创建时机保持不变。
+- `_write_stream_event`与连接生命周期必须只由`backend/http/handler.py`拥有，应用大类和功能HTTP
+  模块不再保留第二份实现。
+
+## CR-08结果
+
+- 删除问师和复盘助手各16行重复流式控制流，并将应用大类中的10行事件写入方法归入HTTP共享层；
+  新共享实现29行、两个调用适配共3行，生产代码净减少10行。
+- 新增专项测试固定四个响应头、中文NDJSON序列化、增量顺序、完成事件、业务错误事件和关闭状态。
+- 候选324项、纯`app/`导出261项及45项Playwright通过；24个JavaScript文件、API/架构注册表、
+  Git空白检查和SQLite完整性检查通过。
+- 本批不修改提示词、模型选择、会员计次、流式正文、前端解析、API路径、数据库或数据源。
+
+本批基线为`xiaobai-reduction-07-provider-ownership-20260801`；检查点为
+`xiaobai-reduction-08-ndjson-transport-20260801`。
+
+## CR-09验收口径
+
+- 只有消费者全部属于单一领域、且能够按原函数体机械移动的方法才从应用门面移出。
+- `_ifind_field`与`_ifind_row_code`继续保持静态/类方法签名、字段优先级、大小写规则和代码正则。
+- 账号委托属于稳定公开门面；系统设置属于跨领域协调；后台刷新留到CR-11，本批均不得删除或重写。
+- 移动后`DashboardService`必须继续通过Mixin解析同名方法，调用点和返回值不变。
+
+## CR-09结果
+
+- 将iFinD字段匹配和股票代码提取两个方法从应用大类机械移动到股池服务，原版与迁移方法AST逐项
+  相等；应用大类不再直接拥有股池专属实现。
+- 连同迁移期遗留空行，`backend/application.py`减少32行，股池服务增加24行，生产代码净减少8行。
+- 候选324项、纯`app/`导出261项、24个JavaScript文件、API/架构注册表、Git空白检查和SQLite
+  完整性检查通过；本批不涉及页面、CSS或浏览器行为。
+- 本批不修改字段匹配、涨跌停原因补全、接口、数据源、缓存、数据库、权限或前端。
+
+本批基线为`xiaobai-reduction-08-ndjson-transport-20260801`；检查点为
+`xiaobai-reduction-09-service-facade-20260801`。
+
+## CR-10验收口径
+
+- 只移动调用方、数据表和业务含义均明确属于单一领域的方法；数据库连接、事务和返回值必须保持不变。
+- `list_sector_phase_overrides`、`save_sector_phase_override`与`delete_sector_phase_override`必须由
+  `backend/features/heaven/repository.py`拥有，并继续通过`ReviewDatabase`的Mixin解析。
+- 不修改表结构、迁移顺序、时间格式、排序、冲突更新或删除结果语义。
+- `wencai_saved_queries`及其三个方法属于已登记的账户隔离兼容数据；即使前端入口已取消，也必须保留。
+
+## CR-10结果
+
+- 将五行行业阶段覆盖的查询、保存和删除三个方法从根级`database.py`机械移动到问天Repository；
+  调用名称、SQL、事务边界、时间值和返回结果均未改变。
+- 根级数据库门面不再直接拥有问天领域的持久化实现，问财历史兼容表和方法完整保留，未扩大删除范围。
+- 34项Repository、问天、账户隔离、清理契约及迁移定向测试通过；候选324项、纯`app/`导出261项、
+  24个JavaScript文件、API/架构注册表、Git空白检查和SQLite完整性检查通过。
+- 本批不修改页面、CSS、API、数据库结构、行情、数据源、业务计算、LLM、权限或后台任务。
+
+本批基线为`xiaobai-reduction-09-service-facade-20260801`；检查点为
+`xiaobai-reduction-10-repository-ownership-20260801`。
+
+## CR-11验收口径
+
+- 导入`backend.application`或构造`DashboardService`不得启动后台调度；必须先成功绑定HTTP端口，
+  再由运行时显式启动。
+- 同一`InProcessJobRunner`重复启动调度器必须返回同一活动线程，停止必须置位并在限定时间内等待退出，
+  有序停止后允许重新启动。
+- 运行时关闭顺序固定为：停止调度、等待已提交任务、关闭HTTP服务器；迁移对比工具继续兼容原版入口。
+- 三个任务的注册定义、5秒刷新频率、3秒初始延迟、幂等键、锁、重试、业务函数和结果不得改变。
+- 声明的超时继续是目标与审计字段；Python线程不能安全强杀，本批不伪造硬取消能力。
+
+## CR-11结果
+
+- 删除`DashboardService`构造阶段的调度副作用，端口占用、模块导入和单元测试不再提前创建后台写线程；
+  `backend/bootstrap/runtime.py`成为正式启动与停止所有者。
+- `InProcessJobRunner`集中持有调度停止事件和线程引用；重复启动幂等，停止可等待，原任务锁、持久化运行
+  状态、成功幂等、失败记录和后续重试逻辑保持不变。
+- 新增语法树与运行顺序门禁，固定“构造不启动”“绑定后启动”“停止后关服”，并补齐重复启动与重启测试。
+- 候选328项、纯`app/`导出265项和45项Playwright通过；24个JavaScript文件、API/架构注册表、
+  Git空白检查和SQLite完整性检查通过。
+- 本批没有可安全删除的重复任务实现；为补齐原先缺失的生命周期，生产代码净增加24行。增加内容仅为
+  调度状态、幂等启停和运行时委托，不新增业务层、任务或兼容包装。
+- 本批不修改页面、CSS、API、数据源、刷新计算、自动选股条件、数据库结构、权限或LLM。
+
+本批基线为`xiaobai-reduction-10-repository-ownership-20260801`；检查点为
+`xiaobai-reduction-11-background-jobs-20260801`。
+
+## CR-11人工验收修正
+
+- 2026-08-02人工验收发现本地页面可访问，但行情与LLM同时无法连接。第一原因是验收服务由受限
+  自动化会话启动，子进程继承了禁止外部网络访问的权限；重新在主机正常网络权限下启动后恢复。
+- 随后的主模型连接测试暴露`LLMServiceMixin`机械迁移时遗漏`validate_text`导入，导致请求在真正
+  访问模型前抛出`NameError`并关闭HTTP连接；恢复原依赖并增加保存模型连接探测的运行契约测试。
+- 网站自身实测`000001`返回Tushare日K 60根、分时242点；主模型
+  `MiniMax-M2.7-highspeed`在2236毫秒内回复`OK`，证明服务进程的数据与LLM出网链路均已恢复。
+- 修正后候选329项、纯`app/`导出266项通过；本次只恢复缺失导入和测试，不修改模型配置、额度、
+  提示词、回退策略、行情来源或计算逻辑。
+- 继续验收观势时发现模型已经成功返回，但问天服务在保存解势记录前关闭了HTTP连接。原因是原版
+  `server.py`已有的`secrets`导入在机械拆分到问天服务时遗漏，生成非观气记录去重键时触发
+  `NameError`。迁移版恢复该标准库依赖，并增加“模型成功返回后保存观势结果”的完整服务回归测试。
+- 使用`000001 平安银行`完成真实页面复测：六爻安全门6/6通过，解势结果正常返回并写入历史，
+  `8797`错误日志为空。该修正不改变提示词、模型选择、额度、卦象计算、记录结构或前端行为。
+
+本修正基线为`xiaobai-reduction-11-background-jobs-20260801`；检查点为
+`xiaobai-reduction-11-runtime-connectivity-fix-20260802`；后续解势修正检查点为
+`xiaobai-reduction-11-heaven-interpret-fix-20260802`。
+
+## CR-12验收口径
+
+- 本批只处理不同样式文件中、同为顶层、选择器与完整声明逐字等价的规则；媒体查询、伪状态、
+  动画、问天隔离样式以及仅外形相似的规则不进入删除范围。
+- 删除的必须是较早加载的副本，较晚层继续提供完全相同的最终声明；样式加载顺序、变量、HTML、
+  JavaScript和主题切换逻辑均不改变。
+- 迁移保真测试必须逐段登记允许退休的原始CSS文本，除登记片段外，其余源码继续与原版逐字符相等。
+- 浏览器必须验证跨层顶层精确重复为零，并通过日间、夜间、桌面、390px移动端及全站交互回归。
+
+## CR-12结果
+
+- 通过浏览器CSSOM扫描七层运行样式，共发现57组完整重复规则；本批只批准其中7组跨文件顶层重复，
+  分别涉及工作区显示、折叠侧栏、板块轮动末列、选股概率值、摘要条两项声明及龙虎榜原因列。
+  其余50组位于同文件或嵌套媒体条件等更复杂环境，证据不足，继续保留。
+- 删除7条较早加载的规则，三个生产CSS文件净减少19行、480字节；后层最终规则、选择器优先级与
+  加载顺序均未改变，没有新增兼容覆盖或第二套样式实现。
+- 新增浏览器CSSOM门禁，任何两个样式层再次出现相同顶层选择器与完整声明都会失败；迁移保真门禁
+  只允许已登记的7个精确源码片段退休，其他CSS差异仍会失败。
+- 真实`8797`页面复核情绪周期日间/夜间、龙虎榜和390×844移动端；三个受影响节点的计算样式
+  与删除前一致，移动端无横向溢出。候选330项、CSS/前端契约33项、迁移对照63项及46项
+  Playwright全部通过，24个JavaScript文件、API/架构注册表和SQLite完整性检查通过。
+- 本批不修改页面布局、颜色、字体、间距、响应式规则、主题、动画、业务功能、API、数据库或部署。
+
+本批基线为`xiaobai-reduction-11-heaven-interpret-fix-20260802`；检查点为
+`xiaobai-reduction-12-css-exact-duplicates-20260802`。
+
 ## 人工验收记录
 
 - 2026-08-01：用户检查CR-02与CR-03运行结果，确认未发现明显异常。本记录仅表示本轮可见功能与