refactor(chat): 迁移数据库操作为异步模式并修复相关调用

将同步数据库操作全面迁移为异步模式，主要涉及：
- 将 `with get_db_session()` 改为 `async with get_db_session()`
- 修复相关异步调用链，确保 await 正确传递
- 优化消息管理器、上下文管理器等核心组件的异步处理
- 移除同步的 person_id 获取方法，避免协程对象传递问题

修复 deepcopy 在 StreamContext 中的序列化问题，跳过不可序列化的 asyncio.Task 对象

删除无用的测试文件和废弃的插件清单文件

src/plugin_system/apis/message_api.py

@@ -412,7 +412,7 @@ def count_new_messages_for_users(chat_id: str, start_time: float, end_time: floa
 # =============================================================================
 
 
-def build_readable_messages_to_str(
+async def build_readable_messages_to_str(
     messages: List[Dict[str, Any]],
     replace_bot_name: bool = True,
     merge_messages: bool = False,
@@ -436,7 +436,7 @@ def build_readable_messages_to_str(
     Returns:
         格式化后的可读字符串
     """
-    return build_readable_messages(
+    return await build_readable_messages(
         messages, replace_bot_name, merge_messages, timestamp_mode, read_mark, truncate, show_actions
     )
 

src/plugin_system/apis/person_api.py

@@ -134,7 +134,7 @@ async def is_person_known(platform: str, user_id: int) -> bool:
         return False
 
 
-def get_person_id_by_name(person_name: str) -> str:
+async def get_person_id_by_name(person_name: str) -> str:
     """根据用户名获取person_id
 
     Args:
@@ -148,7 +148,7 @@ def get_person_id_by_name(person_name: str) -> str:
     """
     try:
         person_info_manager = get_person_info_manager()
-        return person_info_manager.get_person_id_by_person_name(person_name)
+        return await person_info_manager.get_person_id_by_person_name(person_name)
     except Exception as e:
         logger.error(f"[PersonAPI] 根据用户名获取person_id失败: person_name={person_name}, error={e}")
         return ""