fix(contact): 修复静态导出时 useSearchParams 需要 Suspense 的问题

- 将 ContactFormContent 组件用 Suspense 包裹
- 添加加载中 fallback 状态
- 确保静态导出兼容性

src/app/(marketing)/contact/page.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState, useEffect, useRef } from 'react';
+import { useState, useEffect, useRef, Suspense } from 'react';
 import { useSearchParams } from 'next/navigation';
 import { z } from 'zod';
 import { Button } from '@/components/ui/button';
@@ -28,7 +28,7 @@ interface FormErrors {
   message?: string;
 }
 
-export default function ContactPage() {
+function ContactFormContent() {
   const searchParams = useSearchParams();
   const isSuccessFromRedirect = searchParams.get('success') === 'true';
   const [isVisible, setIsVisible] = useState(false);
@@ -372,3 +372,15 @@ export default function ContactPage() {
     </main>
   );
 }
+
+export default function ContactPage() {
+  return (
+    <Suspense fallback={
+      <main className="min-h-screen bg-white flex items-center justify-center">
+        <div className="animate-pulse text-[#5C5C5C]">加载中...</div>
+      </main>
+    }>
+      <ContactFormContent />
+    </Suspense>
+  );
+}