新增数据库支持，初始化数据库并创建查询类型和点踩原因表，优化日志记录，添加多个API以支持点踩原因和查询统计功能。

rag2_0/dify/DifyQueryRetrieval_api.py

@@ -21,12 +21,15 @@ import sys
 sys.path.append(os.getcwd())
 from rag2_0.dify.DifyQueryRetrieval import DifyQueryRetrieval
 
+# 确保日志目录存在
+os.makedirs('data/logs', exist_ok=True)
 
 logging.basicConfig(
     level=logging.INFO,
-    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+    format='%(asctime)s - %(name)s - [%(thread)d] - %(levelname)s - %(message)s',
     handlers=[
-        logging.StreamHandler()
+        logging.StreamHandler(),
+        logging.FileHandler(f'data/logs/dify_query_retrieval_{datetime.datetime.now().strftime("%Y%m%d")}.log', encoding='utf-8')
     ]
 )
 logging.getLogger('httpx').setLevel(logging.WARNING)