Tích hợp biểu mẫu liên hệ Astro (Tĩnh & SSR)

---
// src/pages/contact.astro
---
<form id="astro-contact-form" class="space-y-4 max-w-md">
  <div>
    <label class="block text-sm font-semibold mb-1">Your Name</label>
    <input type="text" name="name" required class="w-full border rounded-xl p-2.5" />
  </div>
  <div>
    <label class="block text-sm font-semibold mb-1">Email Address</label>
    <input type="email" name="email" required class="w-full border rounded-xl p-2.5" />
  </div>
  <div>
    <label class="block text-sm font-semibold mb-1">Message</label>
    <textarea name="message" rows="4" required class="w-full border rounded-xl p-2.5"></textarea>
  </div>

  <input type="text" name="_gotcha" style="display:none !important" tabindex="-1" autocomplete="off" />

  <button type="submit" class="btn-primary-editorial py-2.5 px-6">Send Message</button>
</form>

<script>
  const form = document.getElementById('astro-contact-form') as HTMLFormElement;
  form?.addEventListener('submit', async (e) => {
    e.preventDefault();
    const formData = new FormData(form);

    const payload = {
      fields: {
        name: formData.get('name'),
        email: formData.get('email'),
        message: formData.get('message'),
      },
      honeypot: formData.get('_gotcha') || '',
    };

    const res = await fetch('https://www.lugatu.com/api/v1/public/forms/YOUR_PUBLIC_FORM_ID/submissions', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' },
      body: JSON.stringify(payload),
    });

    if (res.ok) {
      alert('Thank you! Message delivered.');
      form.reset();
    }
  });
</script>

import type { APIRoute } from 'astro';

export const POST: APIRoute = async ({ request }) => {
  const data = await request.formData();
  const fields = {
    name: data.get('name')?.toString(),
    email: data.get('email')?.toString(),
    message: data.get('message')?.toString(),
  };

  const res = await fetch(`https://www.lugatu.com/api/v1/forms/${import.meta.env.LUGATU_FORM_ID}/submissions`, {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${import.meta.env.LUGATU_API_KEY}`,
      'Content-Type': 'application/json',
      'Idempotency-Key': crypto.randomUUID(),
    },
    body: JSON.stringify({ fields }),
  });

  return new Response(JSON.stringify({ success: res.ok }), {
    status: res.status,
    headers: { 'Content-Type': 'application/json' },
  });
};