功能：企微回调支持图片消息，路由到 Agent 图片分析

收到图片先回复"正在分析"，异步调 VLM 分析后主动回复结果。

app/routers/wechat_callback.py

@@ -70,11 +70,19 @@ async def wechat_agent_message(
         asyncio.create_task(_process_agent_message(user_id, content))
         return PlainTextResponse(content="success")
 
+    # ---- 图片消息 → Agent 图片分析 ----
+    if msg_type == "image":
+        user_id = msg.get("FromUserName", "")
+        media_id = msg.get("MediaId", "")
+        logger.info(f"收到企微图片: user={user_id}, media_id={media_id}")
+        asyncio.create_task(_process_agent_image(user_id, media_id))
+        return PlainTextResponse(content="success")
+
     return PlainTextResponse(content="success")
 
 
 async def _process_agent_message(user_id: str, content: str):
-    """异步处理消息并主动回复"""
+    """异步处理文字消息并主动回复"""
     try:
         from app.services.agent_dispatcher import get_agent_dispatcher
         from app.services.wechat_service import get_wechat_service
@@ -88,6 +96,30 @@ async def _process_agent_message(user_id: str, content: str):
         logger.error(f"Agent消息处理失败: user={user_id}, error={e}", exc_info=True)
 
 
+async def _process_agent_image(user_id: str, media_id: str):
+    """异步处理图片消息：先回复"正在分析"，再调 VLM 分析"""
+    try:
+        from app.services.agent_dispatcher import get_agent_dispatcher
+        from app.services.wechat_service import get_wechat_service
+
+        wechat = get_wechat_service()
+        # 先回复提示，避免用户等太久
+        await wechat.send_text_message(user_id, "正在分析图片，请稍候...")
+
+        dispatcher = get_agent_dispatcher()
+        reply = await dispatcher.handle_image(user_id, media_id)
+
+        await wechat.send_text_message(user_id, reply)
+    except Exception as e:
+        logger.error(f"Agent图片处理失败: user={user_id}, error={e}", exc_info=True)
+        try:
+            from app.services.wechat_service import get_wechat_service
+            wechat = get_wechat_service()
+            await wechat.send_text_message(user_id, "图片处理失败，请稍后重试。")
+        except Exception:
+            pass
+
+
 async def _process_card_button_click(msg: dict):
     """
     处理模板卡片按钮点击事件（两步状态机）