add test connectivity

src/utils/llm/__init__.py

@@ -7,7 +7,13 @@ LLM 调用模块
 - call_llm_with_template: 使用模板调用（最常用）
 """
 
-from .client import call_llm, call_llm_json, call_llm_with_template, call_llm_with_task_name
+from .client import (
+    call_llm, 
+    call_llm_json, 
+    call_llm_with_template, 
+    call_llm_with_task_name,
+    test_connectivity
+)
 from .config import LLMMode, get_task_mode
 from .exceptions import LLMError, ParseError, ConfigError
 
@@ -16,10 +22,10 @@ __all__ = [
     "call_llm_json", 
     "call_llm_with_template",
     "call_llm_with_task_name",
+    "test_connectivity",
     "LLMMode",
     "get_task_mode",
     "LLMError",
     "ParseError",
     "ConfigError",
 ]
-

src/utils/llm/client.py

@@ -172,3 +172,30 @@ async def call_llm_with_task_name(
             
     return await call_llm_with_template(template_path, infos, mode, max_retries)
 
+
+def test_connectivity(mode: LLMMode = LLMMode.NORMAL) -> bool:
+    """
+    测试 LLM 服务连通性 (同步版本)
+    
+    Args:
+        mode: 测试使用的模式 (NORMAL/FAST)
+        
+    Returns:
+        bool: 连接成功返回 True，失败返回 False
+    """
+    try:
+        config = LLMConfig.from_mode(mode)
+        if HAS_LITELLM:
+            # 使用 litellm 同步接口
+            litellm.completion(
+                model=config.model_name,
+                messages=[{"role": "user", "content": "你好"}],
+                api_key=config.api_key,
+                base_url=config.base_url,
+            )
+        else:
+            # 直接调用 requests 实现
+            _call_with_requests(config, "test")
+        return True
+    except Exception:
+        return False