feat: 从黄果 NET hgdjnet-server 9bfbafe 导入 HKDJ 官网后端

来源：hgdjnet-server 9bfbafe10d417deea959bd53117bc88a10e60a83
项目身份 HKDJ / JHA-216，独立官网仓库，Jenkins 守卫键 hkdjnet
测试目录 /server/hkdj_net，App/Web API 30331/30332

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pub/common/errors/error.go

@@ -0,0 +1,39 @@
+package errors
+
+import (
+	"fmt"
+)
+
+// SrvErr 错误定义
+type SrvErr struct {
+	Code  CodeType `json:"code"`
+	Msg   string   `json:"msg"`
+	Tips  string   `json:"tip,omitempty"`
+	Cause string   `json:"-"`
+}
+
+// New create an error
+func New(code CodeType, msg string, cause string) *SrvErr {
+	return &SrvErr{
+		Code:  code,
+		Msg:   msg,
+		Cause: cause,
+	}
+}
+
+// New create an error
+func NewTips(code CodeType, tips string, cause string) *SrvErr {
+	return &SrvErr{
+		Code:  code,
+		Msg:   tips,
+		Tips:  tips,
+		Cause: cause,
+	}
+}
+
+func (s *SrvErr) Error() string {
+	if s == nil {
+		return ""
+	}
+	return fmt.Sprintf("code = %d, msg = %s ,case = %v", s.Code, s.Msg, s.Cause)
+}