feat: integrate NFO repair into scheduled folder scan

- Add FolderScanService.run_folder_scan() calling perform_nfo_repair_scan()
- Remove startup-time NFO repair from fastapi_app lifespan
- Update docs/NFO_GUIDE.md: repair now runs as part of daily scan
- Update tests to verify integration wiring
- Update ARCHITECTURE.md and scheduler_service for scan scheduling

src/server/fastapi_app.py

@@ -242,7 +242,6 @@ async def lifespan(_application: FastAPI):
         from src.server.services.initialization_service import (
             perform_initial_setup,
             perform_media_scan_if_needed,
-            perform_nfo_repair_scan,
             perform_nfo_scan_if_needed,
         )
         
@@ -313,10 +312,6 @@ async def lifespan(_application: FastAPI):
 
                 # Run media scan only on first run
                 await perform_media_scan_if_needed(background_loader)
-
-                # Scan every series NFO on startup and repair any that are
-                # missing required tags by queuing them for background reload
-                await perform_nfo_repair_scan(background_loader)
             else:
                 logger.info(
                     "Download service initialization skipped - "