施工(HEL-226): 实现登录门户与本机免密切换账号

用设备 Cookie 和授权表记住本机已验证账号，登录页按确认样图做成门户，不再把密码写进浏览器。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

backend/http/handler.py

@@ -9,7 +9,13 @@ from http.cookies import SimpleCookie
 from typing import Any
 from urllib.parse import unquote
 
-from backend.bootstrap.config import SESSION_COOKIE, SESSION_MAX_AGE, STATIC_DIR
+from backend.bootstrap.config import (
+    DEVICE_COOKIE,
+    DEVICE_MAX_AGE,
+    SESSION_COOKIE,
+    SESSION_MAX_AGE,
+    STATIC_DIR,
+)
 from backend.features.accounts.security import token_hash
 from backend.http.context import correlation_id
 from backend.http.errors import normalize_error_payload
@@ -21,15 +27,21 @@ class HttpTransportMixin:
     application_service: Any
     route_registry: Any
 
-    def session_token(self) -> str:
+    def cookie_value(self, name: str) -> str:
         cookie = SimpleCookie()
         try:
             cookie.load(self.headers.get("Cookie", ""))
         except Exception:
             return ""
-        morsel = cookie.get(SESSION_COOKIE)
+        morsel = cookie.get(name)
         return morsel.value if morsel else ""
 
+    def session_token(self) -> str:
+        return self.cookie_value(SESSION_COOKIE)
+
+    def device_token(self) -> str:
+        return self.cookie_value(DEVICE_COOKIE)
+
     def require_auth(self, send_error: bool = True) -> bool:
         raw_token = self.session_token()
         service = self.application_service
@@ -79,15 +91,18 @@ class HttpTransportMixin:
             return self.require_member()
         return True
 
-    def session_cookie(self, value: str, clear: bool = False) -> str:
-        max_age = 0 if clear else SESSION_MAX_AGE
-        cookie = (
-            f"{SESSION_COOKIE}={value}; Path=/; HttpOnly; SameSite=Lax; Max-Age={max_age}"
-        )
+    def _cookie_header(self, name: str, value: str, max_age: int) -> str:
+        cookie = f"{name}={value}; Path=/; HttpOnly; SameSite=Lax; Max-Age={max_age}"
         if self.headers.get("X-Forwarded-Proto", "").lower() == "https":
             cookie += "; Secure"
         return cookie
 
+    def session_cookie(self, value: str, clear: bool = False) -> str:
+        return self._cookie_header(SESSION_COOKIE, value, 0 if clear else SESSION_MAX_AGE)
+
+    def device_cookie(self, value: str, clear: bool = False) -> str:
+        return self._cookie_header(DEVICE_COOKIE, value, 0 if clear else DEVICE_MAX_AGE)
+
     def read_json_body(self, allow_empty: bool = False) -> dict[str, Any]:
         length = int(self.headers.get("Content-Length", "0"))
         if length == 0 and allow_empty:
@@ -132,7 +147,7 @@ class HttpTransportMixin:
         self,
         payload: dict[str, Any],
         status: HTTPStatus = HTTPStatus.OK,
-        headers: dict[str, str] | None = None,
+        headers: dict[str, str] | list[tuple[str, str]] | tuple[tuple[str, str], ...] | None = None,
     ) -> None:
         request_id = getattr(self, "_correlation_id", "")
         if not request_id:
@@ -145,7 +160,8 @@ class HttpTransportMixin:
         self.send_header("Content-Length", str(len(content)))
         self.send_header("Cache-Control", "no-store")
         self.send_header("X-Request-ID", request_id)
-        for name, value in (headers or {}).items():
+        header_items = headers.items() if isinstance(headers, dict) else (headers or ())
+        for name, value in header_items:
             self.send_header(name, value)
         self.end_headers()
         self.wfile.write(content)