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/route.ts

@@ -0,0 +1,77 @@
+import { NextResponse } from "next/server";
+import { randomBytes, createHash } from "crypto";
+import { auth } from "@/auth";
+import { prisma } from "@/lib/prisma";
+
+export async function GET() {
+  try {
+    const session = await auth();
+    if (!session?.user?.id)
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+    const keys = await prisma.apiKey.findMany({
+      where: { userId: session.user.id, revoked: false },
+      select: {
+        id: true,
+        name: true,
+        keyPrefix: true,
+        createdAt: true,
+        lastUsedAt: true,
+      },
+      orderBy: { createdAt: "desc" },
+    });
+
+    return NextResponse.json(keys, { status: 200 });
+  } catch (error) {
+    console.error("Error listing API keys:", error);
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    );
+  }
+}
+
+export async function POST(request: Request) {
+  try {
+    const session = await auth();
+    if (!session?.user?.id)
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+    const body = await request.json().catch(() => ({}));
+    const name =
+      typeof body.name === "string" && body.name.trim()
+        ? body.name.trim()
+        : "Default";
+
+    const rawHex = randomBytes(24).toString("hex");
+    const fullKey = `al_${rawHex}`;
+    const keyPrefix = fullKey.slice(0, 10);
+    const keyHash = createHash("sha256").update(fullKey).digest("hex");
+
+    const apiKey = await prisma.apiKey.create({
+      data: {
+        userId: session.user.id,
+        name,
+        keyHash,
+        keyPrefix,
+      },
+      select: {
+        id: true,
+        name: true,
+        keyPrefix: true,
+        createdAt: true,
+      },
+    });
+
+    return NextResponse.json(
+      { ...apiKey, key: fullKey },
+      { status: 201 }
+    );
+  } catch (error) {
+    console.error("Error creating API key:", error);
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    );
+  }
+}