Initial commit — AI-powered coding tutor (Professor)

Next.js 16, React 19, Monaco editor, Anthropic SDK, multi-provider AI,
Wandbox Python execution, iframe HTML preview, SQLite auth + session persistence.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/auth/me/route.ts

@@ -0,0 +1,8 @@
+import { NextResponse } from 'next/server';
+import { getAuthUser } from '@/lib/auth';
+
+export async function GET() {
+  const user = await getAuthUser();
+  if (!user) return NextResponse.json({ user: null });
+  return NextResponse.json({ user: { id: user.userId, email: user.email } });
+}