fix(chat): 修复 plan executor 对嵌套 user_info 数据结构的解析兼容性

`action_message` 可能以对象或字典的形式出现，且用户信息统一嵌套在 `user_info` 字段下。

旧代码在处理字典格式时，未能正确处理此嵌套结构，导致无法正确解析用户信息。本次修改统一了逻辑，确保在两种情况下都能稳定地从 `user_info` 中提取用户ID和昵称，增强了代码的健壮性。

src/chat/planner_actions/plan_executor.py

@@ -126,7 +126,13 @@ class PlanExecutor:
         try:
             logger.info(f"执行回复动作: {action_info.action_type}, 原因: {action_info.reasoning}")
 
-            if action_info.action_message.user_info.user_id == str(global_config.bot.qq_account):
+            # 获取用户ID - 兼容对象和字典
+            if hasattr(action_info.action_message, "user_info"):
+                user_id = action_info.action_message.user_info.user_id
+            else:
+                user_id = action_info.action_message.get("user_info", {}).get("user_id")
+
+            if user_id == str(global_config.bot.qq_account):
                 logger.warning("尝试回复自己，跳过此动作以防止死循环。")
                 return {
                     "action_type": action_info.action_type,
@@ -246,15 +252,17 @@ class PlanExecutor:
                 return
 
             # 获取用户信息 - 处理对象和字典两种情况
-            if hasattr(action_info.action_message, "user_id"):
+            if hasattr(action_info.action_message, "user_info"):
                 # 对象情况
-                user_id = action_info.action_message.user_id
+                user_info = action_info.action_message.user_info
-                user_name = getattr(action_info.action_message, "user_nickname", user_id) or user_id
+                user_id = user_info.user_id
-                user_message = getattr(action_info.action_message, "content", "")
+                user_name = user_info.user_nickname or user_id
+                user_message = action_info.action_message.content
             else:
                 # 字典情况
-                user_id = action_info.action_message.get("user_id", "")
+                user_info = action_info.action_message.get("user_info", {})
-                user_name = action_info.action_message.get("user_nickname", user_id) or user_id
+                user_id = user_info.get("user_id")
+                user_name = user_info.get("user_nickname") or user_id
                 user_message = action_info.action_message.get("content", "")
 
             if not user_id: