feat（新功能）:

fix（修复bug）:  推荐接口 请求参数打印
docs（文档变更）:
refactor（重构）:
test(增加测试):

app/api/api_recommendation.py

@@ -92,6 +92,7 @@ async def get_recommendations(user_id: int, category: str, brand_id: int, brand_
             ]
     """
     try:
+        logger.info(f"user_id:{user_id}, category:{category}, num_recommendations:{num_recommendations}")
         start_time = time.time()
         cache_key = (user_id, category)
         # === 新增：用户存在性检查 ===