refactor(server): indexer & worker & sync perf (#15504)

tests/affine-cloud-copilot/runtime-config.json

@@ -17,5 +17,12 @@
         "path": "/tmp/affine-cloud-copilot-storage"
       }
     }
+  },
+  "indexer": {
+    "enabled": true,
+    "provider": {
+      "type": "embedded",
+      "endpoint": ""
+    }
   }
 }