refactor: simplify NFO handling, remove legacy services

- Drop nfo_factory, nfo_repair_service, nfo_service, series_manager_service
- Delete key_resolution_service, consolidate into folder_rename_service
- Remove bulk of NFO-related tests (coverage via integration tests)
- Streamline SeriesApp, background_loader, initialization services
- Add folder_rename_service to scheduler

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/cli/nfo_cli.py

@@ -1,19 +1,22 @@
 """CLI command for NFO management.
 
-This script provides command-line interface for creating, updating,
-and checking NFO metadata files.
+Note: NFO service has been removed. This CLI is no longer functional.
 """
 
-import asyncio
-import logging
 import sys
 from pathlib import Path
 
 # Add src to path
 sys.path.insert(0, str(Path(__file__).parent.parent.parent))
 
-from src.config.settings import settings
-from src.core.services.series_manager_service import SeriesManagerService
+def main():
+    """Main entry point."""
+    print("NFO CLI is no longer available - NFO service has been removed.")
+    print("Use the web API endpoints for NFO management.")
+    return 1
+
+if __name__ == "__main__":
+    sys.exit(main())
 
 logger = logging.getLogger(__name__)