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/api/Cargo.toml

@@ -11,6 +11,7 @@ postgres = ["infra/postgres"]
 auth-oidc = ["infra/auth-oidc"]
 auth-jwt = ["infra/auth-jwt"]
 jellyfin = ["infra/jellyfin"]
+local-files = ["infra/local-files", "dep:tokio-util"]
 
 [dependencies]
 k-core = { git = "https://git.gabrielkaszewski.dev/GKaszewski/k-core", features = [
@@ -51,3 +52,4 @@ tracing = "0.1"
 async-trait = "0.1"
 dotenvy = "0.15.7"
 time = "0.3"
+tokio-util = { version = "0.7", features = ["io"], optional = true }