[Feat] Fixed unreliable email protection

[DSCmatter]

Contact Form Request Forwarding with Spam Protection

This PR Fixes #148

Summary

Implements backend email forwarding for the contact form with basic spam protection and input validation.

Changes

• Added pages/api/contact.ts to handle contact form submissions
  • Validates required fields (name, email, text) and email format
  • Implements a honeypot field (confirm_email) to silently ignore bot submissions
  • Forwards valid requests to team@ergoplatform.org using nodemailer
• Updated components/shared/ContributeForm.tsx
  • Added invisible honeypot field
  • Updated submission flow to use /api/contact API route

Verification

• Honeypot filled → 200 OK, no email sent
• Valid request → 200 OK, email send attempted (blocked locally due to mock SMTP)
• Missing fields → 400 Bad Request

Notes

Email delivery requires valid SMTP credentials. Configure the following environment variables:
SMTP_HOST, SMTP_PORT, SMTP_USER, SMTP_PASS, SMTP_SECURE, SMTP_FROM
Example is given .env.example in the project's root