Add contact form with Cloudflare Worker

- Create /contact page with project/topic dropdowns
- Add honeypot spam protection
- Integrate Cloudflare Turnstile captcha
- Create Cloudflare Worker for form submission
  - Validates Turnstile token
  - Sends confirmation email to submitter
  - Sends notification to admin with reply-to
  - Uses MailLayer API for email delivery
- Add Contact link to footer

Author: julianengel

src/components/Footer.astro

@@ -5,6 +5,7 @@
     <div class="footer-content">
         <span>© 2025 <a href="https://simplebytes.com">Simple Bytes</a>, a <a href="https://meome.com/?ref=simplebytes" target="_blank" rel="noopener">Meome</a> company</span>
         <nav class="footer-links">
+            <a href="/contact">Contact</a>
             <a href="/privacy">Privacy</a>
             <a href="/terms">Terms</a>
         </nav>