feat: 将智谱模型设为默认首要选择

backend/app/agent/llm_factory.py

@@ -51,7 +51,7 @@ class LLMFactory:
 
     # 模型创建器映射
     CREATORS = {
+        "zhipu": create_zhipu,
         "local": create_local,
         "deepseek": create_deepseek,
-        "zhipu": create_zhipu,
     }

backend/app/agent/service.py

@@ -42,7 +42,7 @@ class AIAgentService:
             raise RuntimeError("没有可用的模型")
         return self
 
-    async def process_message(self, message: str, thread_id: str, model: str = "local", user_id: str = "default_user") -> dict:
+    async def process_message(self, message: str, thread_id: str, model: str = "zhipu", user_id: str = "default_user") -> dict:
         """处理用户消息，返回包含回复、token统计和耗时的字典"""
         if model not in self.graphs:
             # 回退到第一个可用模型