Fix WebSocket room subscription format

src/server/middleware/setup_redirect.py

@@ -129,7 +129,9 @@ class SetupRedirectMiddleware(BaseHTTPMiddleware):
                     # Check if initialization is complete
                     try:
                         from src.server.database.connection import get_db_session
-                        from src.server.database.system_settings_service import SystemSettingsService
+                        from src.server.database.system_settings_service import (
+                            SystemSettingsService,
+                        )
                         
                         async with get_db_session() as db:
                             is_complete = await SystemSettingsService.is_initial_scan_completed(db)

src/server/web/templates/loading.html

@@ -305,7 +305,9 @@
                 // Subscribe to system room for progress updates
                 ws.send(JSON.stringify({
                     action: 'join',
-                    room: 'system'
+                    data: {
+                        room: 'system'
+                    }
                 }));
             };