fix: LDAP批量导入用户auth_source设为ldap而非默认local

backend/internal/handler/ldap.go

@@ -465,6 +465,7 @@ func BatchImportLDAP(c *gin.Context) {
 			Username:       uid,
 			DisplayName:    cn,
 			Role:           req.Role,
+			AuthSource:     "ldap",
 			IsActive:       &isActive,
 			HashedPassword: "-",
 		}