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/api/auth.py

@@ -147,10 +147,7 @@ async def setup_auth(req: SetupRequest):
         # Trigger initialization in background task
         import asyncio
 
-        from src.server.services.initialization_service import (
-            perform_initial_setup,
-            perform_nfo_scan_if_needed,
-        )
+        from src.server.services.initialization_service import perform_initial_setup
         from src.server.services.progress_service import get_progress_service
         
         progress_service = get_progress_service()
@@ -161,9 +158,6 @@ async def setup_auth(req: SetupRequest):
                 # Perform the initial series sync and mark as completed
                 await perform_initial_setup(progress_service)
                 
-                # Perform NFO scan if configured
-                await perform_nfo_scan_if_needed(progress_service)
-                
                 # Start scheduler if anime_directory is now set
                 try:
                     from src.server.services.scheduler.scheduler_service import (