init: hgmj server initial commit

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

common/stderr/error.go

@@ -0,0 +1,32 @@
+package stderr
+
+import (
+	"errors"
+	"strings"
+)
+
+var (
+	InsertExistError = errors.New("E11000 duplicate key error")
+	WriteBrokenError = errors.New("broken pipe")
+)
+
+func IsEqual(err error, target error) bool {
+	if err != nil && target != nil {
+		return err.Error() == target.Error()
+	}
+	return false
+}
+
+func IsContain(err interface{}, target error) bool {
+	if err != nil && target != nil {
+		var origin string
+		switch err := err.(type) {
+		case string:
+			origin = err
+		case error:
+			origin = err.Error()
+		}
+		return strings.Contains(origin, target.Error())
+	}
+	return false
+}