feat(web): Next.js 15 shell — design tokens, landing, auth pages

apps/web/components/logo.tsx

@@ -0,0 +1,14 @@
+import Link from 'next/link';
+import { cn } from '@/lib/cn';
+
+export function Logo({ className }: { className?: string }) {
+  return (
+    <Link href="/" className={cn('inline-flex items-center gap-2 text-[--color-fg]', className)}>
+      <svg width="18" height="18" viewBox="0 0 18 18" fill="none" aria-hidden>
+        <rect x="1" y="1" width="16" height="16" rx="3" stroke="currentColor" strokeWidth="1.25" />
+        <path d="M5 12V6L9 9.5L13 6V12" stroke="currentColor" strokeWidth="1.25" strokeLinecap="round" strokeLinejoin="round" />
+      </svg>
+      <span className="text-[13px] font-semibold tracking-tight">BuildMyMCPServer</span>
+    </Link>
+  );
+}