Add new API endpoints for media retrieval by country and enhance configuration

- Introduced `/api/tmdb` and `/api/collection/missing-locations` endpoints to the backend for improved media management.
- Added a new `get_media_by_country` function in the collection API to fetch media items based on country codes.
- Updated configuration to allow overriding *arr base URLs via environment variables for better flexibility.
- Enhanced frontend with a new `MissingLocations` component and integrated it into the routing structure.
- Improved the `CollectionMap` component to handle country selection and display media items accordingly.
- Added testing dependencies in `requirements.txt` and updated frontend configuration for testing support.

backend/main.py

@@ -9,7 +9,7 @@ import os
 import logging
 from contextlib import asynccontextmanager
 
-from app.api import collection, watched, pins, admin
+from app.api import collection, watched, pins, admin, tmdb, missing_locations
 from app.core.config import settings
 from app.core.database import init_db, close_db
 
@@ -45,6 +45,8 @@ app.include_router(collection.router, prefix="/api/collection", tags=["collectio
 app.include_router(watched.router, prefix="/api/watched", tags=["watched"])
 app.include_router(pins.router, prefix="/api/pins", tags=["pins"])
 app.include_router(admin.router, prefix="/admin", tags=["admin"])
+app.include_router(tmdb.router, prefix="/api/tmdb", tags=["tmdb"])
+app.include_router(missing_locations.router, prefix="/api/collection/missing-locations", tags=["missing-locations"])
 
 # Serve frontend static files
 # Check multiple possible locations (dev, Nix build, etc.)