Initial commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

common/ysqr/error.go

@@ -0,0 +1,15 @@
+package ysqr
+
+import "errors"
+
+type ErrContentInvalid struct {
+}
+
+func (ErrContentInvalid) Error() string {
+	return "content invalid"
+}
+
+var (
+	ErrInvalidUser    = errors.New("user invalid")
+	ErrContentIllegal = errors.New("content invalid")
+)