fix(HEL-488): 盘中日K补上今天实时变化的一根

悬浮窗和详情页在 Tushare rt_k / iFinD 不可用时，改用免费实时行情或当日分时生成今日K，收盘后正式日K就绪再无缝替换。

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

config/architecture-inventory.json

@@ -533,8 +533,8 @@
     },
     {
       "path": "frontend/pages/market/preview.js",
-      "bytes": 18178,
-      "lines": 446
+      "bytes": 18339,
+      "lines": 450
     },
     {
       "path": "backend/features/heaven/trend.py",
@@ -681,16 +681,16 @@
       "bytes": 6092,
       "lines": 138
     },
+    {
+      "path": "frontend/pages/market/stock-detail.js",
+      "bytes": 6041,
+      "lines": 134
+    },
     {
       "path": "frontend/pages/dragon-tiger/page.html",
       "bytes": 5754,
       "lines": 85
     },
-    {
-      "path": "frontend/pages/market/stock-detail.js",
-      "bytes": 5690,
-      "lines": 124
-    },
     {
       "path": "frontend/pages.config.js",
       "bytes": 5385,