fix(HEL-412): 刷新降级不再整次失败，并补齐准备中提示

手动刷新与自动补跑共用可用数据判定：日线推算或上一交易日快照记为部分/准备中成功，避免前端误报刷新失败。HTTP JSON 解析错误不再把请求正文写入日志。

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

config/architecture-inventory.json

@@ -330,6 +330,7 @@
     "system_service": "backend/features/system/service.py",
     "account_bridge": "backend/features/accounts/application.py",
     "job_lifecycle": "backend/jobs/service.py",
+    "job_refresh_status": "backend/jobs/refresh.py",
     "feature_routes": "backend/features/*/routes.py"
   },
   "numeric_normalization": [
@@ -472,8 +473,8 @@
     },
     {
       "path": "frontend/shared/shell.css",
-      "bytes": 63659,
-      "lines": 3763
+      "bytes": 63733,
+      "lines": 3767
     },
     {
       "path": "backend/features/heaven/engine.py",
@@ -560,6 +561,11 @@
       "bytes": 14743,
       "lines": 342
     },
+    {
+      "path": "frontend/shared/dashboard.js",
+      "bytes": 14740,
+      "lines": 316
+    },
     {
       "path": "frontend/shared/admin.js",
       "bytes": 14410,
@@ -575,11 +581,6 @@
       "bytes": 13219,
       "lines": 289
     },
-    {
-      "path": "frontend/shared/dashboard.js",
-      "bytes": 12894,
-      "lines": 274
-    },
     {
       "path": "backend/features/market/insights_auction_data.py",
       "bytes": 12829,
@@ -785,16 +786,16 @@
       "bytes": 2514,
       "lines": 63
     },
+    {
+      "path": "backend/jobs/service.py",
+      "bytes": 2337,
+      "lines": 59
+    },
     {
       "path": "backend/features/mentor/routes.py",
       "bytes": 2299,
       "lines": 57
     },
-    {
-      "path": "backend/jobs/service.py",
-      "bytes": 2219,
-      "lines": 60
-    },
     {
       "path": "backend/features/screener/regime.py",
       "bytes": 2202,
@@ -830,6 +831,11 @@
       "bytes": 1791,
       "lines": 46
     },
+    {
+      "path": "backend/jobs/refresh.py",
+      "bytes": 1728,
+      "lines": 46
+    },
     {
       "path": "backend/features/alerts/routes.py",
       "bytes": 1687,