修复：为 user-svc 添加健康检查和启动顺序控制

backend/test.proto

@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+package test;
+
+option go_package = "test/proto";
+
+message TestMessage {
+  string name = 1;
+  int32 age = 2;
+}