feat: add subscription service — user auth, Stripe billing, API keys, dashboard

- NextAuth v5 with email+password credentials, JWT sessions
- Registration, login, email verification, password reset flows
- Stripe integration: Free (15/day), Starter ($5/1k/mo), Pro ($20/100k/mo)
- API key management (cb_ prefix) with hash-based validation
- Dashboard with generations history, settings, billing management
- Rate limiting: Redis daily counter (free), DB monthly (paid)
- Generate route auth: Bearer API key + session, anonymous allowed
- Worker userId propagation for generation history
- Pricing section on landing page, auth-aware navbar
- Middleware with route protection, CORS for codeboard.vectry.tech
- Docker env vars for auth, Stripe, email (smtp.migadu.com)

apps/web/src/app/api/settings/purge/route.ts

@@ -0,0 +1,20 @@
+import { NextResponse } from "next/server";
+import { auth } from "@/auth";
+import { prisma } from "@/lib/prisma";
+
+export async function POST() {
+  try {
+    const session = await auth();
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    }
+
+    await prisma.generation.deleteMany({
+      where: { userId: session.user.id },
+    });
+
+    return NextResponse.json({ success: true });
+  } catch {
+    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
+  }
+}