feat: Refactor service management scripts to use a unified dev script

- Added package.json to manage development scripts.
- Updated restart-services.ps1 to call the new dev script for starting services.
- Refactored start-admin.ps1, start-backend.ps1, start-frontend.ps1, and start-mcp.ps1 to utilize the dev script for starting respective services.
- Enhanced stop-services.ps1 to improve process termination logic by matching command patterns.

backend/src/controllers/search.rs

@@ -178,7 +178,8 @@ pub async fn search(
             .all(&ctx.db)
             .await
         {
-            Ok(rows) => rows,
+            Ok(rows) if !rows.is_empty() => rows,
+            Ok(_) => fallback_search(&ctx, &q, limit).await?,
             Err(_) => fallback_search(&ctx, &q, limit).await?,
         }
     } else {