✨新增加载外部工具集的配置项，修复依赖

nonebot_plugin_marshoai/config.py

@@ -33,6 +33,7 @@ class ConfigModel(BaseModel):
     marshoai_enable_time_prompt: bool = True
     marshoai_enable_tools: bool = True
     marshoai_load_builtin_tools: bool = True
+    marshoai_toolset_dir: list = []
     marshoai_azure_endpoint: str = "https://models.inference.ai.azure.com"
     marshoai_temperature: float | None = None
     marshoai_max_tokens: int | None = None
@@ -117,4 +118,4 @@ if config.marshoai_use_yaml_config:
     
         config = ConfigModel(**yaml_config)
 else:
-    logger.info("MarshoAI 支持新的 YAML 配置系统，若要使用，请将 MARSHOAI_USE_YAML_CONFIG 配置项设置为 true。")
+    logger.info("MarshoAI 支持新的 YAML 配置系统，若要使用，请将 MARSHOAI_USE_YAML_CONFIG 配置项设置为 true。")