feat: implement transcode settings repository and integrate with local-files provider

k-tv-backend/api/src/routes/files.rs

@@ -269,15 +269,11 @@ async fn update_transcode_settings(
     CurrentUser(_user): CurrentUser,
     Json(req): Json<UpdateTranscodeSettingsRequest>,
 ) -> Result<Json<TranscodeSettingsResponse>, ApiError> {
-    let pool = state.sqlite_pool.read().await.clone()
-        .ok_or_else(|| ApiError::not_implemented("sqlite not available"))?;
-
-    let ttl = req.cleanup_ttl_hours as i64;
-    sqlx::query("UPDATE transcode_settings SET cleanup_ttl_hours = ? WHERE id = 1")
-        .bind(ttl)
-        .execute(&pool)
-        .await
-        .map_err(|e| ApiError::internal(e.to_string()))?;
+    if let Some(repo) = &state.transcode_settings_repo {
+        repo.save_cleanup_ttl(req.cleanup_ttl_hours)
+            .await
+            .map_err(|e| ApiError::internal(e.to_string()))?;
+    }
 
     let tm_opt = state.transcode_manager.read().await.clone();
     if let Some(tm) = tm_opt {