feat(api): sessions加is_del过滤+filehelper置顶标记,accounts加avatar(raw_json提取)

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

yunke-server/app/api/routers/organization.py

@@ -103,6 +103,10 @@ async def list_accounts(
     * WeChat: account_id=wx_id, nickname=nick_name, user_id, user_name, phone,
       contacts_num, group_num, is_on_job, raw_json (verbatim upstream record).
     * WhatsApp: account_id=uid (+ same projection).
+
+    ``avatar`` is extracted from ``raw_json.headImageUrl`` (WeChat wxUser/list
+    records carry it; WhatsApp businessSalesList records have no avatar key,
+    so they naturally resolve to ``None`` — same key logic for both channels).
     """
     wechat_q = sa.select(
         WechatAccount.wx_id.label("account_id"),
@@ -171,6 +175,9 @@ async def list_accounts(
             contacts_num=row.contacts_num,
             group_num=row.group_num,
             is_on_job=row.is_on_job,
+            # 头像从原始记录提取(对齐云客员工聊天窗口左侧头像,2026-08-25):
+            # WeChat headImageUrl;WA 原始记录无该键 -> None
+            avatar=(row.raw_json or {}).get("headImageUrl"),
             raw_json=row.raw_json,
         )
         for row in rows