feat: add contact/support page with form

[jxsonyx]

Contact page implementation completed

Changes made

• Updated page.tsx

  • Added stronger client-side validation for email, subject, and message
  • Added field-level error messages
  • Added success/error messaging with aria-live
  • Preserved optional auto-reply checkbox
  • Kept layout mobile-friendly and responsive

• Updated route.ts

  • Added support email constants and placeholder email-send logic
  • Validates email format, subject length, and message length
  • Implements rate limiting per IP
  • Stores submissions in an in-memory mock database
  • Logs support notification and optional auto-reply actions

Validation

• Checked both edited files for syntax/type issues
• No errors found

No commands were run.

Closes #591

Made changes.

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