refactor(chat): remove get_friends action and auto-include friends list in prompt

Remove the GetFriendsAction class and its corresponding handler, replacing
the action-based retrieval with automatic inclusion of friends list data
in the prompt template. This simplifies the available actions for the AI
by providing friend information as static context rather than requiring
an explicit action call.

Author: This-is-XiaoDeng

src/lang/zh_hans/chat.yaml

@@ -1345,14 +1345,6 @@ main_session:
         "subject": "和他聊聊关于XXX"          // 简单描述你想要给 TA 发送的内容（概括主题）。
     }}
 
-    ### 获取好友列表
-
-    > 这个动作能让你看到你的好友列表，包括好友的介绍、好感度、上次与你互动的时间等信息。
-
-    {{
-        "type": "get_friends"
-    }}
-
     ### 跳过处理
 
     {{
@@ -1373,6 +1365,8 @@ main_session:
 
     {}
 
+    {}
+
     ## 附加信息
 
     {}

src/plugins/nonebot_plugin_chat/core/main_session.py

@@ -40,8 +40,8 @@ class CustomAction(BaseModel):
     estimated_time: int
 
 
-class GetFriendsAction(BaseModel):
-    type: Literal["get_friends"]
+# class GetFriendsAction(BaseModel):
+#     type: Literal["get_friends"]
 
 
 class SendPrivateMsgAction(BaseModel):
@@ -55,7 +55,7 @@ class RestAction(BaseModel):
     time: int
 
 
-BoredAction = Union[SkipAction, CustomAction, GetFriendsAction, SendPrivateMsgAction, RestAction]
+BoredAction = Union[SkipAction, CustomAction, SendPrivateMsgAction, RestAction]
 
 
 class BoredActionResponse(BaseModel):
@@ -206,6 +206,7 @@ async def generate_system_prompt(self) -> str:
             "main_session.prompt",
             self.lang_str,
             await lang.text("prompt_group.identify", self.lang_str),
+            await self.get_friends(),
             await lang.text("prompt_group.time", self.lang_str, datetime.now().isoformat()),
             state_str,
             "\n".join(
@@ -257,8 +258,8 @@ async def process_boredom(self) -> None:
 
     async def handle_action(self, action: BoredAction, fetcher: MessageFetcher) -> None:
         match action.type:
-            case "get_friends":
-                fetcher.session.insert_message(generate_message(await self.get_friends(), "user"))
+            # case "get_friends":
+            #     fetcher.session.insert_message(generate_message(await self.get_friends(), "user"))
             case "send_private_message":
                 # 记录发送私聊前的状态，用于后续判断用户是否回复
                 self._current_action_send_private_time = datetime.now()