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/app/core/config.py

@@ -21,10 +21,10 @@ class Settings(BaseSettings):
     radarr_api_key: str = os.getenv("RADARR_API_KEY", "")
     lidarr_api_key: str = os.getenv("LIDARR_API_KEY", "")
     
-    # *arr base URLs
-    sonarr_url: str = "http://127.0.0.1:8989"
-    radarr_url: str = "http://127.0.0.1:7878"
-    lidarr_url: str = "http://127.0.0.1:8686"
+    # *arr base URLs (can be overridden via environment variables)
+    sonarr_url: str = os.getenv("SONARR_URL", "http://127.0.0.1:8989")
+    radarr_url: str = os.getenv("RADARR_URL", "http://127.0.0.1:7878")
+    lidarr_url: str = os.getenv("LIDARR_URL", "http://127.0.0.1:8686")
     
     # Admin
     admin_token: Optional[str] = os.getenv("MOVIEMAP_ADMIN_TOKEN")