feat(groups): chat_group 补 6 群主/建群列 + 复合PK迁移修复 + 存量回填

对齐云客员工聊天窗口·微信群 tab(2026-08-25 真机验证 raw_json 键):
- ChatGroup 加列 owner_name/owner_wxid/owner_alias/owner_avatar/
  friend_count/create_time(全 nullable)
- scraper _normalize_chat_group 同名提取;createTime 兼容 ms-int 与
  'YYYY-MM-DD HH:mm:ss'(smoke.db 实测 1105 行全为后者),复用
  _parse_add_time 归一 ms-epoch
- 迁移 099ac2097fa2:加 6 列 + 修复 Task1 评审遗留 drift——PK 由单列
  room_id 变更为复合 (room_id, channel, owner_account_id) 且
  owner_account_id NOT NULL(对齐模型 8a99940;smoke.db 1105 行无 NULL,
  未兜底编造数据);SQLite 走 batch 重建(copy_from 显式旧结构),
  MySQL 渲染为直接 ALTER(离线 --sql 已验证)
- 回填脚本 scripts/backfill_chat_group_fields.py(幂等,逐列只补空);
  smoke.db 实跑 backfilled 1105/1105,重跑 0/1105
- GroupOut 加 6 字段(model_validate 自动输出,路由无改)

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

yunke-server/app/scraper/wechat.py

@@ -889,6 +889,17 @@ def _normalize_chat_group(record: dict[str, Any]) -> dict[str, Any]:
     Adds ``channel="wechat"`` and preserves the original record under
     ``raw_json``. ``None``-safe on every field: missing fields become ``None``
     rather than raising, so a partial payload does not break the scrape.
+
+    2026-08-25 补充列（对齐云客 员工聊天窗口·微信群 tab，真机验证 raw_json 键）：
+
+    * ``ownerName``    -> ``owner_name`` (群主昵称，上游脱敏)
+    * ``ownerWchatId`` -> ``owner_wxid`` (群主微信号，上游脱敏)
+    * ``ownerAlias``   -> ``owner_alias`` (群主微信号别名)
+    * ``ownerImage``   -> ``owner_avatar`` (群主头像)
+    * ``friendCount``  -> ``friend_count`` (群成员中员工好友数)
+    * ``createTime``   -> ``create_time`` (建群时间;实测 smoke.db 全量为
+      ``'YYYY-MM-DD HH:mm:ss'`` 字符串,另兼容 ms-int/数字串,统一归一为
+      ms-epoch int,复用 ``_parse_add_time`` 的双形态解析)
     """
     return {
         "room_id": record.get("friendWxId"),
@@ -908,6 +919,13 @@ def _normalize_chat_group(record: dict[str, Any]) -> dict[str, Any]:
         "add_members": None,
         "last_chat_time": record.get("lastChatTime"),
         "update_time": None,
+        # 群主/建群补充列(2026-08-25;raw_json 键 -> 同名列)
+        "owner_name": record.get("ownerName"),
+        "owner_wxid": record.get("ownerWchatId"),
+        "owner_alias": record.get("ownerAlias"),
+        "owner_avatar": record.get("ownerImage"),
+        "friend_count": _coerce_int_or_none(record.get("friendCount")),
+        "create_time": _parse_add_time(record.get("createTime")),
         "version": record.get("version"),
         "raw_json": record,
     }