feat: add local files provider with indexing and rescan functionality

- Implemented LocalFilesProvider to manage local video files.
- Added LocalIndex for in-memory and SQLite-backed indexing of video files.
- Introduced scanning functionality to detect video files and extract metadata.
- Added API endpoints for listing collections, genres, and series based on provider capabilities.
- Enhanced existing routes to check for provider capabilities before processing requests.
- Updated frontend to utilize provider capabilities for conditional rendering of UI elements.
- Implemented rescan functionality to refresh the local files index.
- Added database migration for local files index schema.

k-tv-backend/infra/src/lib.rs

@@ -21,6 +21,9 @@ mod channel_repository;
 mod schedule_repository;
 mod user_repository;
 
+#[cfg(feature = "local-files")]
+pub mod local_files;
+
 // Re-export for convenience
 pub use db::run_migrations;
 
@@ -33,3 +36,6 @@ pub use schedule_repository::SqliteScheduleRepository;
 
 #[cfg(feature = "jellyfin")]
 pub use jellyfin::{JellyfinConfig, JellyfinMediaProvider};
+
+#[cfg(feature = "local-files")]
+pub use local_files::{LocalFilesConfig, LocalFilesProvider, LocalIndex, decode_stream_id};