后端统一时区为 UTC

resources/sql/002_create_audit_logs_table.sql

@@ -17,7 +17,7 @@ CREATE TABLE IF NOT EXISTS audit_logs (
     request_data JSONB,
     response_status INTEGER,
     error_message TEXT,
-    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL
+    timestamp TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL
 );
 
 -- 创建索引以提高查询性能