fix: 长连接 sender_id 提取修复 + 去重复赋值

- 移除重复的 sender_id = sender.sender_id.user_id 赋值（会覆盖已修复的值）
- 添加 sender_id 属性调试日志，方便排查 SDK 对象结构
- 优先用 open_id 构造会话标识，避免 user_id 为 None 的问题
- get_user_info 无权限时用 open_id 缩写作为标识

src/integrations/feishu_longconn_service.py

@@ -78,27 +78,39 @@ class FeishuLongConnService:
             content = message.content
             sender = event.sender
 
-            # 获取发送者ID和群信息（优先 open_id，user_id 可能为 None）
-            sender_open_id = getattr(sender.sender_id, 'open_id', '') or ''
-            sender_user_id = getattr(sender.sender_id, 'user_id', '') or ''
-            sender_id = sender_user_id or sender_open_id or 'unknown'
+            # 获取发送者ID和群信息
+            sender_id_obj = sender.sender_id
+            # 调试：打印 sender 对象的所有属性
             try:
-                tenant_key = sender.sender_id.tenant_key
+                sender_attrs = {k: getattr(sender_id_obj, k, None) for k in ['user_id', 'open_id', 'union_id'] if getattr(sender_id_obj, k, None)}
+                if not sender_attrs:
+                    # 尝试 __dict__ 或 dir
+                    sender_attrs = {k: v for k, v in vars(sender_id_obj).items() if v and not k.startswith('_')} if hasattr(sender_id_obj, '__dict__') else {}
+                logger.info(f"🔍 sender_id 属性: {sender_attrs}")
+            except Exception as e:
+                logger.warning(f"🔍 无法解析 sender_id 属性: {e}, type={type(sender_id_obj)}")
+                sender_attrs = {}
+
+            sender_open_id = getattr(sender_id_obj, 'open_id', '') or ''
+            sender_user_id = getattr(sender_id_obj, 'user_id', '') or ''
+            sender_union_id = getattr(sender_id_obj, 'union_id', '') or ''
+            sender_id = sender_open_id or sender_user_id or sender_union_id or 'unknown'
+            sender_type = getattr(sender, 'sender_type', 'user')
+            try:
+                tenant_key = sender_id_obj.tenant_key
             except:
                 tenant_key = "unknown"
 
-            # 获取发送者姓名（用 open_id 查询，不需要 contact 权限）
-            sender_name = sender_id
-            try:
-                from src.integrations.feishu_service import FeishuService
-                fs = FeishuService()
-                id_for_query = sender_open_id or sender_user_id
-                id_type = 'open_id' if sender_open_id else 'user_id'
-                if id_for_query:
-                    user_info = fs.get_user_info(id_for_query, id_type=id_type)
-                    sender_name = user_info.get('name') or user_info.get('en_name') or sender_id
-            except Exception as e:
-                logger.warning(f"获取发送者信息失败: {e}")
+            # 获取发送者姓名
+            sender_name = f"用户_{sender_id[-8:]}" if len(sender_id) > 8 else sender_id
+            if sender_open_id:
+                try:
+                    from src.integrations.feishu_service import FeishuService
+                    fs = FeishuService()
+                    user_info = fs.get_user_info(sender_open_id, id_type='open_id')
+                    sender_name = user_info.get('name') or user_info.get('en_name') or sender_name
+                except Exception as e:
+                    logger.debug(f"获取发送者姓名失败: {e}")
 
             # 详细日志记录
             chat_type_desc = '群聊(group)' if chat_type == 'group' else '私聊(p2p)' if chat_type == 'p2p' else chat_type
@@ -145,11 +157,7 @@ class FeishuLongConnService:
 
             logger.info(f"✅ 清理后内容: {text_content}")
 
-            # 获取发送者ID
-            sender_id = sender.sender_id.user_id
-
             # 构造会话用户ID（群聊隔离）
-            # 格式: feishu_群聊ID_用户ID
             session_user_id = f"feishu_{chat_id}_{sender_id}"
 
             logger.info(f"🔑 会话标识: {session_user_id}")