feat: Add real-time notification center with WebSocket integration

- Add in-app notification system with database storage
- Implement bell icon component with unread count badge in dashboard header
- Add full Notifications page tab with pagination and filtering (All/Unread/Read)
- Implement real-time WebSocket push notifications to all connected clients
- Add notification API endpoints: GET, PUT /read, DELETE, POST /clear
- Fix critical bug in notificationService where 'status' variable was undefined
- Add Notifications route to App.js routing
- Enhanced UI with notification popup in header and dedicated full-page view
- Auto-reconnect WebSocket with 5s timeout on disconnect
- Support rich notification content with resource details and timestamps

client/build/asset-manifest.json

@@ -1,15 +1,15 @@
 {
   "files": {
-    "main.css": "/static/css/main.b6a66622.css",
-    "main.js": "/static/js/main.0a56784a.js",
+    "main.css": "/static/css/main.4f505a72.css",
+    "main.js": "/static/js/main.29f97b36.js",
     "static/js/453.d456ce70.chunk.js": "/static/js/453.d456ce70.chunk.js",
     "index.html": "/index.html",
-    "main.b6a66622.css.map": "/static/css/main.b6a66622.css.map",
-    "main.0a56784a.js.map": "/static/js/main.0a56784a.js.map",
+    "main.4f505a72.css.map": "/static/css/main.4f505a72.css.map",
+    "main.29f97b36.js.map": "/static/js/main.29f97b36.js.map",
     "453.d456ce70.chunk.js.map": "/static/js/453.d456ce70.chunk.js.map"
   },
   "entrypoints": [
-    "static/css/main.b6a66622.css",
-    "static/js/main.0a56784a.js"
+    "static/css/main.4f505a72.css",
+    "static/js/main.29f97b36.js"
   ]
 }