fix：1.修复一些小问题

backend/app/api/polish.py

@@ -47,7 +47,7 @@ async def polish_text(
         logger.info(f"开始AI去味处理，原文长度: {len(request.original_text)}")
         
         # 调用AI进行去味处理
-        polished_text = await ai_service.generate_text(
+        polished_text = await user_ai_service.generate_text(
             prompt=prompt,
             provider=request.provider,
             model=request.model,

backend/app/api/wizard_stream.py

@@ -926,6 +926,7 @@ async def outline_generator(
         requirements = data.get("requirements", "")
         provider = data.get("provider")
         model = data.get("model")
+        user_id = data.get("user_id")  # 从中间件注入
         
         # 获取项目信息
         yield await SSEResponse.send_progress("加载项目信息...", 10)