Manages FeedEngine instances per user with auto-registration of
sources from FeedSourceProvider implementations.
- Add FeedSourceProvider interface
- Add FeedEngineService with providers array injection
- Update LocationService to implement FeedSourceProvider
Co-authored-by: Ona <no-reply@ona.com>
- Add LocationService to manage LocationSource per user
- Add UserNotFoundError for generic user-related errors
- updateUserLocation throws if source not initialized
Co-authored-by: Ona <no-reply@ona.com>
