✨ feat(command): 回调响应自动回复到 QQ

- 回调服务器可返回 reply 或 messages 字段，插件自动回复到原消息来源
- reply 为纯文本回复，messages 格式同 /webhook 接口
- 支持通过 group_id/user_id 覆盖回复目标
- 无需回复时返回空 JSON 即可
- 更新 README 文档说明回调响应格式

handlers/command.py

@@ -1,11 +1,10 @@
-"""命令监听处理器：匹配 #命令名+空格 格式的消息，转发到外部回调 URL。"""
+"""命令监听处理器：匹配 #命令名+空格 格式的消息，转发到外部回调 URL 并自动回复。"""
 
 import re
 
 import aiohttp
 
 from ..config import COMMAND_CALLBACK_URL, COMMAND_LENGTH, COMMAND_PREFIX
-from ..response import error, ok
 
 
 def build_command_pattern() -> re.Pattern:
@@ -31,11 +30,25 @@ def parse_command(raw_message: str) -> dict | None:
     }
 
 
-async def send_command_callback(data: dict, logger) -> bool:
-    """将命令数据 POST 到外部回调 URL。返回是否成功。"""
+async def send_command_callback(data: dict, event, api, logger) -> None:
+    """将命令数据 POST 到外部回调 URL，根据响应自动回复到 QQ。
+
+    回调服务器返回格式：
+    {
+        "reply": "回复文本",                    // 纯文本回复
+        "messages": [                          // 批量回复（可选，优先于 reply）
+            {"type": "text", "msg": "..."},
+            {"type": "image", "url": "..."},
+            {"type": "file", "url": "..."},
+            {"type": "video", "url": "..."}
+        ]
+    }
+
+    所有字段均为可选，无回复内容时返回空 JSON 即可。
+    """
     if not COMMAND_CALLBACK_URL:
         logger.warning("COMMAND_CALLBACK_URL 未配置，跳过命令回调")
-        return False
+        return
 
     try:
         async with aiohttp.ClientSession() as session:
@@ -50,8 +63,81 @@ async def send_command_callback(data: dict, logger) -> bool:
                         "命令回调失败: status=%d url=%s body=%s",
                         resp.status, COMMAND_CALLBACK_URL, body[:200],
                     )
-                    return False
-                return True
+                    return
+
+                # 解析响应，自动回复
+                try:
+                    result = await resp.json(content_type=None)
+                except Exception:
+                    return
+
+                if not isinstance(result, dict):
+                    return
+
+                await _handle_reply(result, event, api, logger)
+
     except Exception as exc:
         logger.error("命令回调异常: url=%s error=%s", COMMAND_CALLBACK_URL, exc)
-        return False
+
+
+async def _handle_reply(result: dict, event, api, logger) -> None:
+    """处理回调响应，自动回复到原消息来源。"""
+    group_id = result.get("group_id") or (getattr(event.data, "group_id", None))
+    user_id = result.get("user_id") or event.data.user_id
+    messages = result.get("messages")
+    reply = result.get("reply")
+
+    # 批量回复（使用 post_group_msg / post_private_msg 组合消息段）
+    if messages and isinstance(messages, list):
+        text_parts: list[str] = []
+        image_url: str | None = None
+        video_url: str | None = None
+        file_msgs: list[dict] = []
+
+        for msg in messages:
+            msg_type = msg.get("type", "text")
+            if msg_type == "text":
+                text_parts.append(msg.get("msg", ""))
+            elif msg_type == "image":
+                image_url = msg.get("url")
+            elif msg_type == "video":
+                video_url = msg.get("url")
+            elif msg_type == "file":
+                file_msgs.append(msg)
+
+        text = "\n".join(text_parts) if text_parts else None
+
+        try:
+            if group_id:
+                if text or image_url or video_url:
+                    await api.qq.post_group_msg(
+                        group_id=group_id, text=text, image=image_url, video=video_url,
+                    )
+                for fm in file_msgs:
+                    url = fm.get("url", "")
+                    await api.qq.send_group_file(
+                        group_id=group_id, file=url, name=url.split("/")[-1],
+                    )
+            else:
+                if text or image_url or video_url:
+                    await api.qq.post_private_msg(
+                        user_id=user_id, text=text, image=image_url, video=video_url,
+                    )
+                for fm in file_msgs:
+                    url = fm.get("url", "")
+                    await api.qq.send_private_file(
+                        user_id=user_id, file=url, name=url.split("/")[-1],
+                    )
+        except Exception as exc:
+            logger.error("命令回复失败: %s", exc)
+        return
+
+    # 纯文本回复
+    if reply and isinstance(reply, str):
+        try:
+            if group_id:
+                await api.qq.send_group_text(group_id=group_id, text=reply)
+            else:
+                await api.qq.send_private_text(user_id=user_id, text=reply)
+        except Exception as exc:
+            logger.error("命令回复失败: %s", exc)