feat: 新增项目公共工具包，包含日志、错误、数据库、缓存、公共proto

backend/shared/proto/common.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package common;
+
+option go_package = "./common";
+
+message Empty {
+}
+
+message Status {
+  bool success = 1;
+  string message = 2;
+  string code = 3;
+}
+
+message Pagination {
+  int32 page = 1;
+  int32 page_size = 2;
+  int32 total = 3;
+}
+
+message IdRequest {
+  string id = 1;
+}