修复重构后的导入错误和缺失模块

backend/app/memory/mem0_client.py

@@ -1,11 +1,11 @@
-from ..config import (
+from app.config import (
     LLM_API_KEY, ZHIPUAI_API_KEY,
     VLLM_BASE_URL, QDRANT_URL, QDRANT_COLLECTION_NAME, QDRANT_API_KEY,
     LLAMACPP_EMBEDDING_URL, LLAMACPP_API_KEY,
     ZHIPU_EMBEDDING_MODEL, ZHIPU_API_BASE
 )
 from ..model_services import get_embedding_service
-from ..logger import info, warning, error
+from app.logger import info, warning, error
 import time
 """
 Mem0 记忆层客户端封装模块