feat: user auth, API keys, Stripe billing, and dashboard scoping

- NextAuth v5 credentials auth with registration/login pages
- API key CRUD (create, list, revoke) with secure hashing
- Stripe checkout, webhooks, and customer portal integration
- Rate limiting per subscription tier
- All dashboard API endpoints scoped to authenticated user
- Prisma schema: User, Account, Session, ApiKey, plus Stripe fields
- Auth middleware protecting dashboard and API routes

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-Claude)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

apps/web/src/app/api/keys/[id]/route.ts

@@ -0,0 +1,38 @@
+import { NextResponse } from "next/server";
+import { auth } from "@/auth";
+import { prisma } from "@/lib/prisma";
+
+export async function DELETE(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const session = await auth();
+    if (!session?.user?.id)
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+    const { id } = await params;
+
+    const apiKey = await prisma.apiKey.findFirst({
+      where: { id, userId: session.user.id, revoked: false },
+      select: { id: true },
+    });
+
+    if (!apiKey) {
+      return NextResponse.json({ error: "Not found" }, { status: 404 });
+    }
+
+    await prisma.apiKey.update({
+      where: { id: apiKey.id },
+      data: { revoked: true },
+    });
+
+    return NextResponse.json({ success: true }, { status: 200 });
+  } catch (error) {
+    console.error("Error revoking API key:", error);
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    );
+  }
+}