✨ feat: 添加Footer组件并在RootLayout中引入，增强页面结构

style: 更新globals.css，调整sonner-toast背景颜色
fix: 修改request.ts中的日志级别为debug，优化错误信息输出

web/src/components/footer.tsx

@@ -0,0 +1,10 @@
+import config from "@/config";
+import React from "react";
+
+export default function Footer() {
+  return (
+    <footer className="w-full py-6 text-center text-sm text-gray-500 dark:text-gray-400 border-t border-gray-200 dark:border-gray-700 mt-12">
+      © {new Date().getFullYear()} {config.metadata.name} · Powered by {config.owner.name}
+    </footer>
+  );
+}