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/src/routes/config.rs

@@ -1,6 +1,5 @@
 use axum::{Json, Router, extract::State, routing::get};
-use std::sync::Arc;
-use crate::config::Config;
+
 use crate::dto::ConfigResponse;
 use crate::state::AppState;
 
@@ -8,8 +7,9 @@ pub fn router() -> Router<AppState> {
     Router::new().route("/", get(get_config))
 }
 
-async fn get_config(State(config): State<Arc<Config>>) -> Json<ConfigResponse> {
+async fn get_config(State(state): State<AppState>) -> Json<ConfigResponse> {
     Json(ConfigResponse {
-        allow_registration: config.allow_registration,
+        allow_registration: state.config.allow_registration,
+        provider_capabilities: state.media_provider.capabilities(),
     })
 }