fix: 增大了默认的maxtoken防止溢出，messagecq改异步get_image防止阻塞

src/plugins/chat/utils_image.py

@@ -34,7 +34,7 @@ class ImageManager:
             self._ensure_description_collection()
             self._ensure_image_dir()
             self._initialized = True
-            self._llm = LLM_request(model=global_config.vlm, temperature=0.4, max_tokens=300)
+            self._llm = LLM_request(model=global_config.vlm, temperature=0.4, max_tokens=1000)
 
     def _ensure_image_dir(self):
         """确保图像存储目录存在"""