Initial commit

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

app/service/proxyser/error.go

@@ -0,0 +1,31 @@
+package proxyser
+
+import "fmt"
+
+// IllegalInvUserError 非法推广用户
+type IllegalInvUserError struct {
+	UID    uint64
+	Parent uint64
+}
+
+func (i IllegalInvUserError) Error() string {
+	return fmt.Sprintf("illegal invite uid: %d, parent: %d", i.UID, i.Parent)
+}
+
+// SelfInvError 自我推广错误
+type SelfInvError struct {
+	uid uint64
+}
+
+func (s SelfInvError) Error() string {
+	return fmt.Sprintf("self invitation error! uid: %d", s.uid)
+}
+
+// PromStrInvalidError 推广码无效错误
+type PromStrInvalidError struct {
+	PromCode string
+}
+
+func (p PromStrInvalidError) Error() string {
+	return fmt.Sprintf("invalid promCode str: %s", p.PromCode)
+}