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/login/route.ts

@@ -0,0 +1,23 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { db } from '@/db';
+import { users } from '@/db/schema';
+import { verifyPassword, signToken, setAuthCookie } from '@/lib/auth';
+import { eq } from 'drizzle-orm';
+
+export async function POST(req: NextRequest) {
+  const { email, password } = await req.json();
+
+  if (!email || !password) {
+    return NextResponse.json({ error: 'Email and password are required' }, { status: 400 });
+  }
+
+  const user = await db.select().from(users).where(eq(users.email, email)).get();
+  if (!user || !(await verifyPassword(password, user.passwordHash))) {
+    return NextResponse.json({ error: 'Invalid email or password' }, { status: 401 });
+  }
+
+  const token = await signToken({ userId: user.id, email: user.email });
+  await setAuthCookie(token);
+
+  return NextResponse.json({ user: { id: user.id, email: user.email } });
+}