feat(setup): add done button and integrate NFO scan into initialization

- Add /api/setup/unresolved/done endpoint to mark phase complete
- NFO scan now runs after series sync during initialization
- Middleware redirects to /login after setup complete (was /loading)
- Done button allows skipping folder resolution with redirect to NFO scan phase

src/server/api/auth.py

@@ -175,7 +175,6 @@ async def setup_auth(req: SetupRequest):
                     # Continue — scheduler failure should not break initialization
                 
                 # Send completion event
-                from src.server.services.progress_service import ProgressType
                 await progress_service.start_progress(
                     progress_id="initialization_complete",
                     progress_type=ProgressType.SYSTEM,