refactor: migrate from Biome to oxlint/oxfmt, remove contact form

- Replace Biome with oxlint + oxfmt (OXC toolchain) for linting and formatting
- Add .oxlintrc.json and .oxfmtrc.json configuration files
- Update VS Code settings and devcontainer to use oxc-vscode extension
- Remove contact form, Resend email integration, and related server action/schema
- Remove unused UI components (accordion, alert, card, tabs, toggle, etc.)

components/icons.tsx

@@ -41,17 +41,3 @@ export const GitHubIcon = ({ className }: { className?: string }) => (
     <path d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12" />
   </svg>
 );
-
-export const NextjsIcon = ({ className }: { className?: string }) => (
-  <svg
-    xmlns="http://www.w3.org/2000/svg"
-    fill="currentColor"
-    stroke="currentColor"
-    strokeWidth="0"
-    viewBox="0 0 24 24"
-    className={className}
-    aria-hidden="true"
-  >
-    <path d="M18.665 21.978C16.758 23.255 14.465 24 12 24 5.377 24 0 18.623 0 12S5.377 0 12 0s12 5.377 12 12c0 3.583-1.574 6.801-4.067 9.001L9.219 7.2H7.2v9.596h1.615V9.251l9.85 12.727Zm-3.332-8.533 1.6 2.061V7.2h-1.6v6.245Z" />
-  </svg>
-);