tenant: move admin member queries into service

backend/docs/swagger.json

@@ -829,6 +829,20 @@
                         "name": "page",
                         "in": "query"
                     },
+                    {
+                        "enum": [
+                            "member",
+                            "tenant_admin"
+                        ],
+                        "type": "string",
+                        "x-enum-varnames": [
+                            "TenantUserRoleMember",
+                            "TenantUserRoleTenantAdmin"
+                        ],
+                        "description": "Role 按角色过滤（可选）：member/tenant_admin。",
+                        "name": "role",
+                        "in": "query"
+                    },
                     {
                         "type": "integer",
                         "description": "UserID 按用户ID过滤（可选）。",
@@ -848,7 +862,7 @@
                                     "type": "object",
                                     "properties": {
                                         "items": {
-                                            "$ref": "#/definitions/models.TenantUser"
+                                            "$ref": "#/definitions/dto.AdminTenantUserItem"
                                         }
                                     }
                                 }
@@ -1695,6 +1709,27 @@
                 }
             }
         },
+        "dto.AdminTenantUserItem": {
+            "type": "object",
+            "properties": {
+                "tenant_user": {
+                    "description": "TenantUser 租户成员关系记录。",
+                    "allOf": [
+                        {
+                            "$ref": "#/definitions/models.TenantUser"
+                        }
+                    ]
+                },
+                "user": {
+                    "description": "User 用户基础信息（用于展示 username 等）。",
+                    "allOf": [
+                        {
+                            "$ref": "#/definitions/models.User"
+                        }
+                    ]
+                }
+            }
+        },
         "dto.AdminTenantUserJoinResponse": {
             "type": "object",
             "properties": {