fix: streamline initialization flow after setup

- Remove nfo_scan and media_scan from loading page steps (no longer shown in UI)
- Remove perform_nfo_scan_if_needed calls from fastapi_app and auth.py
- Always redirect to /setup/unresolved after initialization completes
  instead of conditionally checking for unresolved folders
- Fix middleware to allow access to /loading page - let it handle
  its own redirect flow via WebSocket events

This ensures users always reach the unresolved folders page after
initial setup to manually configure any unmatched anime series.

src/server/middleware/setup_redirect.py

@@ -127,21 +127,10 @@ class SetupRedirectMiddleware(BaseHTTPMiddleware):
                     # Otherwise redirect to login
                     return RedirectResponse(url="/login", status_code=302)
                 elif path == "/loading":
-                    # Check if initialization is complete
-                    try:
-                        from src.server.database.connection import get_db_session
-                        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)
-                            if is_complete:
-                                # Initialization complete, redirect to login
-                                return RedirectResponse(url="/login", status_code=302)
-                    except Exception:
-                        # If we can't check, allow access to loading page
-                        pass
+                    # Always allow access to loading page - it handles its own
+                    # redirect flow via WebSocket events (initialization_complete
+                    # event triggers redirect to /setup/unresolved)
+                    pass
         
         # Skip setup check for exempt paths
         if self._is_path_exempt(path):