fix: add image_type=message param to download API

image_daemon.py

@@ -104,8 +104,9 @@ def extract_image_keys(msg):
 def download_image(token, image_key):
     headers = {"Authorization": f"Bearer {token}"}
     resp = requests.get(f"{FEISHU_BASE}/im/v1/images/{image_key}",
-        headers=headers, timeout=30)
+        headers=headers, params={"image_type": "message"}, timeout=30)
     if resp.status_code == 200 and len(resp.content) > 100:
+        log(f"✅ 下载成功: {len(resp.content)} bytes")
         return resp.content
     log(f"❌ 下载图片失败 {image_key}: HTTP {resp.status_code}, {resp.text[:200]}")
     log(f"   需要权限: im:resource")