重构代码，统一config配置

backend/app/agent/llm_factory.py

@@ -0,0 +1,57 @@
+# app/llm_factory.py
+import os
+from ..config import ZHIPUAI_API_KEY, DEEPSEEK_API_KEY, VLLM_BASE_URL, LLAMACPP_API_KEY
+from langchain_community.chat_models import ChatZhipuAI
+from langchain_openai import ChatOpenAI
+from pydantic import SecretStr
+
+class LLMFactory:
+    @staticmethod
+    def create_zhipu():
+        api_key = ZHIPUAI_API_KEY
+        if not api_key:
+            raise ValueError("ZHIPUAI_API_KEY not set")
+        return ChatZhipuAI(
+            model="glm-4.7-flash",
+            api_key=api_key,
+            temperature=0.1,
+            max_tokens=4096,
+            timeout=120.0,
+            max_retries=3,
+            streaming=True,
+        )
+
+    @staticmethod
+    def create_deepseek():
+        api_key = DEEPSEEK_API_KEY
+        if not api_key:
+            raise ValueError("DEEPSEEK_API_KEY not set")
+        return ChatOpenAI(
+            base_url="https://api.deepseek.com",
+            api_key=SecretStr(api_key),
+            model="deepseek-reasoner",
+            temperature=0.1,
+            max_tokens=4096,
+            timeout=60.0,
+            max_retries=2,
+            streaming=True,
+        )
+
+    @staticmethod
+    def create_local():
+        base_url = VLLM_BASE_URL
+        return ChatOpenAI(
+            base_url=base_url,
+            api_key=SecretStr(LLAMACPP_API_KEY),
+            model="gemma-4-E4B-it",
+            timeout=60.0,
+            max_retries=2,
+            streaming=True,
+        )
+
+    # 模型创建器映射
+    CREATORS = {
+        "local": create_local,
+        "deepseek": create_deepseek,
+        "zhipu": create_zhipu,
+    }