feat(auth): include subscription tier in token and session payload

- Adds subscription tier info to access/refresh tokens.
- Stores tier details in session Redis record.
- Returns tier data in login/register response.
- Uses default tier when user has none.

app/[locale]/admin/subscriptions/page.tsx

@@ -0,0 +1,64 @@
+import type { Metadata } from "next";
+import { redirect } from "next/navigation";
+import { cookies } from "next/headers";
+import Header from "@/components/Header";
+import { getSession } from "@/lib/redis/session";
+import { getAllSubscriptionTiers } from "@/lib/prisma/queries/subscription-tiers";
+import { AdminSubscriptionDashboard } from "@/components/admin/subscription-dashboard";
+import { getUserById } from "@/lib/prisma/queries/users";
+
+export async function generateMetadata(): Promise<Metadata> {
+  return {
+    title: "Assinaturas e Permissões",
+    description:
+      "Gerencie os planos de assinatura, recursos avançados e permissões dos usuários.",
+  };
+}
+
+export default async function AdminSubscriptionsPage({
+  params,
+}: {
+  params: Promise<{ locale: string }>;
+}) {
+  const { locale } = await params;
+  const cookieStore = await cookies();
+  const sessionId = cookieStore.get("sessionId")?.value;
+
+  if (!sessionId) {
+    redirect(`/${locale}`);
+  }
+
+  const session = await getSession(sessionId);
+
+  if (!session || session.userId !== 1) {
+    redirect(`/${locale}`);
+  }
+
+  const tiers = await getAllSubscriptionTiers(true);
+  const adminUser = await getUserById(session.userId);
+
+  return (
+    <div className="min-h-screen bg-background text-foreground">
+      <Header />
+      <main className="container mx-auto px-4 py-10 space-y-8">
+        <section className="space-y-2">
+          <h1 className="text-3xl font-bold">Assinaturas & Permissões</h1>
+          <p className="text-muted-foreground">
+            Configure planos, recursos e vincule usuários às assinaturas disponíveis.
+          </p>
+          {adminUser?.subscription_tier && (
+            <p className="text-sm text-muted-foreground">
+              Seu plano atual:{" "}
+              <span className="font-semibold uppercase">
+                {adminUser.subscription_tier.name} ({adminUser.subscription_tier.slug})
+              </span>
+            </p>
+          )}
+        </section>
+
+        <AdminSubscriptionDashboard initialTiers={tiers} />
+      </main>
+    </div>
+  );
+}
+