统一抽象 封装 模型配置配置管理

app/ai/nova_chat/chat.py

@@ -4,7 +4,7 @@
 依赖：LLM 枚举、nova_chat/prompts
 """
 
-from app.ai.models import LLM
+from app.ai.model_config import NovaChatModel
 from app.ai.nova_chat.prompts import SYSTEM_PROMPT
 from app.core.logger import log
 
@@ -24,8 +24,7 @@ async def nova_chat(resume_text: str, message: str, history: list[dict],
     messages.append(("human", message))
 
     try:
-        llm = LLM.ZM_GPT_5_2.create(temperature=0.7)
-        result = await llm.ainvoke(messages)
+        result = await NovaChatModel.CHAT.ainvoke(messages)
         return result.content.strip()
     except Exception as e:
         log.error(f"Nova Chat AI 调用失败: {e}")