feat(transcoding): add FFmpeg HLS transcoding support

- Introduced `TranscodeManager` for managing on-demand transcoding of local video files.
- Added configuration options for transcoding in `Config` and `LocalFilesConfig`.
- Implemented new API routes for managing transcoding settings, stats, and cache.
- Updated `LocalFilesProvider` to support transcoding capabilities.
- Created frontend components for managing transcode settings and displaying stats.
- Added database migration for transcode settings.
- Enhanced existing routes and DTOs to accommodate new transcoding features.

k-tv-backend/mcp/src/main.rs

@@ -90,11 +90,16 @@ async fn main() -> anyhow::Result<()> {
         if let k_core::db::DatabasePool::Sqlite(ref sqlite_pool) = db_pool {
             let base_url = std::env::var("BASE_URL")
                 .unwrap_or_else(|_| "http://localhost:3000".to_string());
-            let lf_cfg = infra::LocalFilesConfig { root_dir: dir, base_url };
+            let lf_cfg = infra::LocalFilesConfig {
+                root_dir: dir,
+                base_url,
+                transcode_dir: None,
+                cleanup_ttl_hours: 24,
+            };
             let idx = Arc::new(infra::LocalIndex::new(&lf_cfg, sqlite_pool.clone()).await);
             let scan_idx = Arc::clone(&idx);
             tokio::spawn(async move { scan_idx.rescan().await; });
-            registry.register("local", Arc::new(infra::LocalFilesProvider::new(idx, lf_cfg)));
+            registry.register("local", Arc::new(infra::LocalFilesProvider::new(idx, lf_cfg, None)));
         }
     }
 
@@ -145,6 +150,7 @@ impl IMediaProvider for NoopMediaProvider {
             search: false,
             streaming_protocol: StreamingProtocol::DirectFile,
             rescan: false,
+            transcode: false,
         }
     }