feat(api): 新增消息统计API端点

将原有的获取最近消息的API替换为功能更强大的消息统计API。
新的 `/messages/recent` 端点允许按天数和消息类型（发送、接收或全部）查询机器人的消息数量统计。
- 支持 `days` 和 `message_type` 查询参数。
- 实现统计逻辑，区分机器人发送和接收的消息。
- 增加异常处理，提高API的健壮性。

src/api/message_router.py

@@ -1,13 +1,48 @@
-from fastapi import APIRouter
+import time
+from typing import Literal
+
+from fastapi import APIRouter, HTTPException, Query
+
+from src.config.config import global_config
 from src.plugin_system.apis import message_api
 
 router = APIRouter()
 
 @router.get("/messages/recent")
-async def get_recent_messages(chat_id: str, limit: int = 10):
+async def get_message_stats(
+    days: int = Query(1, ge=1, description="指定查询过去多少天的数据"),
+    message_type: Literal["all", "sent", "received"] = Query("all", description="筛选消息类型: 'sent' (BOT发送的), 'received' (BOT接收的), or 'all' (全部)")
+):
     """
-    获取最近的聊天记录
+    获取BOT在指定天数内的消息统计数据。
     """
-    # 假设 message_api.get_recent_messages 是一个异步函数
+    try:
-    messages = await message_api.get_recent_messages(chat_id=chat_id, limit=limit)
+        end_time = time.time()
-    return {"chat_id": chat_id, "messages": messages}
+        start_time = end_time - (days * 24 * 3600)
+
+        messages = await message_api.get_messages_by_time(start_time, end_time)
+
+        sent_count = 0
+        received_count = 0
+        bot_qq = str(global_config.bot.qq_account)
+
+        for msg in messages:
+            if msg.get("user_id") == bot_qq:
+                sent_count += 1
+            else:
+                received_count += 1
+        if message_type == "sent":
+            return {"days": days, "message_type": message_type, "count": sent_count}
+        elif message_type == "received":
+            return {"days": days, "message_type": message_type, "count": received_count}
+        else:
+            return {
+                "days": days,
+                "message_type": message_type,
+                "sent_count": sent_count,
+                "received_count": received_count,
+                "total_count": len(messages)
+            }
+
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))