feat: add CLI args, health endpoint, and fix torznab search

- Add clap for CLI argument parsing (-c config, -p port)
- Add health endpoint showing service status at /api/health
- Add IndexerType enum for auto URL construction (jackett/prowlarr/torznab)
- Fix Axum 0.8 route syntax ({param} instead of :param)
- Fix torznab search to use 'q' param instead of artist/album (Jackett only supports q)

src/api/mod.rs

@@ -16,10 +16,11 @@ use crate::AppState;
 
 pub fn routes(state: AppState) -> Router {
     Router::new()
+        .route("/health", get(health))
         .route("/tracks", get(list_tracks))
         .route("/tracks", post(create_track))
-        .route("/tracks/:id", get(get_track))
-        .route("/tracks/:id", delete(delete_track))
+        .route("/tracks/{id}", get(get_track))
+        .route("/tracks/{id}", delete(delete_track))
         .route("/tracks/search", get(search_tracks))
         .route("/stats", get(get_stats))
         .nest("/indexers", indexer_controller::routes())
@@ -28,6 +29,37 @@ pub fn routes(state: AppState) -> Router {
         .with_state(state)
 }
 
+#[derive(serde::Serialize)]
+struct Health {
+    status: &'static str,
+    services: ServiceStatus,
+}
+
+#[derive(serde::Serialize)]
+struct ServiceStatus {
+    torrent: bool,
+    metadata: bool,
+    indexers: Vec<String>,
+}
+
+async fn health(State(state): State<AppState>) -> Json<Health> {
+    let state = state.read().await;
+    let indexers = state
+        .indexer_service
+        .list_indexers()
+        .into_iter()
+        .map(|i| i.name)
+        .collect();
+    Json(Health {
+        status: "ok",
+        services: ServiceStatus {
+            torrent: state.torrent_service.is_connected().await,
+            metadata: state.metadata_service.is_connected(),
+            indexers,
+        },
+    })
+}
+
 async fn list_tracks(State(state): State<AppState>) -> Json<Vec<Track>> {
     let state = state.read().await;
     Json(state.aggregator.get_all().to_vec())