解决超话签到中选择性签到的逻辑问题

backend/api_service/app/routers/accounts.py

@@ -304,7 +304,34 @@ async def list_topics(
         return error_response("Cookie 解密失败", "COOKIE_ERROR", status_code=400)
 
     topics = await _get_super_topics(cookie_str, account.weibo_user_id)
-    return success_response({"topics": topics, "total": len(topics)})
+    return success_response({
+        "topics": topics,
+        "total": len(topics),
+        "selected_topics": account.selected_topics,
+    })
+
+
+@router.put("/{account_id}/topics")
+async def save_selected_topics(
+    account_id: str,
+    body: dict = Body(...),
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """保存用户选择的签到超话列表。空列表或 null 表示签到全部。"""
+    account = await _get_owned_account(account_id, user, db)
+    selected = body.get("selected_topics")
+    # null 或空列表都表示全部签到
+    if selected and isinstance(selected, list) and len(selected) > 0:
+        account.selected_topics = selected
+    else:
+        account.selected_topics = None
+    await db.commit()
+    await db.refresh(account)
+    return success_response(
+        _account_to_dict(account),
+        f"已保存 {len(selected) if selected else 0} 个超话" if selected else "已设为签到全部超话",
+    )
 
 
 # ---- MANUAL SIGNIN ----