feat: integrate contact form with API

src/components/sections/contact-section.tsx

@@ -115,7 +115,22 @@ export function ContactSection() {
     setIsSubmitting(true);
     
     try {
-      await new Promise(resolve => setTimeout(resolve, 1500));
+      const response = await fetch('/api/contact', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          ...formData,
+          csrfToken: storedToken,
+        }),
+      });
+
+      const data = await response.json();
+
+      if (!response.ok) {
+        throw new Error(data.message || '提交失败');
+      }
       
       const newCsrfToken = generateCSRFToken();
       setCSRFTokenToStorage(newCsrfToken);
@@ -127,7 +142,7 @@ export function ContactSection() {
       setShowToast(true);
     } catch (error) {
       setIsSubmitting(false);
-      setToastMessage('提交失败，请稍后重试。');
+      setToastMessage(error instanceof Error ? error.message : '提交失败，请稍后重试。');
       setToastType('error');
       setShowToast(true);
     }