新增支付配置备份导入

backend/internal/modules/paymentconfig/dto.go

@@ -7,6 +7,8 @@ var (
 	ErrDuplicateDefault    = errors.New("duplicate default config for provider")
 	ErrInvalidProvider     = errors.New("invalid payment provider")
 	ErrInvalidStatus       = errors.New("invalid status")
+	ErrInvalidBackup       = errors.New("invalid payment config backup")
+	ErrEmptyBackup         = errors.New("payment config backup is empty")
 	ErrCannotDeleteInUse   = errors.New("cannot delete config in use")
 	ErrEncryptionFailed    = errors.New("encryption failed")
 	ErrDecryptionFailed    = errors.New("decryption failed")
@@ -116,3 +118,10 @@ type ExportBackup struct {
 	Total      int         `json:"total"`
 	Configs    []ConfigDTO `json:"configs"`
 }
+
+// ImportBackupResult 支付配置备份导入结果。
+type ImportBackupResult struct {
+	Total   int `json:"total"`
+	Created int `json:"created"`
+	Updated int `json:"updated"`
+}