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/fastapi_app.py

@@ -344,7 +344,6 @@ async def lifespan(_application: FastAPI):
         from src.server.services.initialization_service import (
             perform_initial_setup,
             perform_media_scan_if_needed,
-            perform_nfo_scan_if_needed,
         )
         
         try:
@@ -373,9 +372,6 @@ async def lifespan(_application: FastAPI):
                         "exist yet): %s", e
                     )
 
-                # Run NFO scan only on first run (if configured)
-                await perform_nfo_scan_if_needed()
-
                 # Initialize download service
                 try:
                     from src.server.utils.dependencies import get_download_service