feat(admin): centralize subscriptions under /admin?tab=subscriptions

Replaced the dedicated /admin/subscriptions page with a redirect to the central admin panel’s subscriptions tab. Removed session checks, imports, and the AdminSubscriptionDashboard since routing and access are now handled centrally. This streamlines admin UX and keeps access control unified.

components/admin/AdminPanelTabs.tsx

@@ -0,0 +1,74 @@
+"use client";
+
+import { useState } from "react";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { AdminSubscriptionTab } from "@/components/admin/AdminSubscriptionTab";
+import { AdminItemManager, type AdminItemsResponse } from "@/components/admin/items/AdminItemManager";
+
+interface AdminPanelTabsProps {
+  adminUser: {
+    subscription_tier?: {
+      name: string;
+      slug: string;
+    } | null;
+    username?: string;
+    email?: string;
+  } | null;
+  initialTiers: any[];
+  itemsData: AdminItemsResponse;
+  initialTab?: "overview" | "subscriptions" | "items";
+}
+
+export function AdminPanelTabs({
+  adminUser,
+  initialTiers,
+  itemsData,
+  initialTab = "overview",
+}: AdminPanelTabsProps) {
+  const [activeTab, setActiveTab] = useState<"overview" | "subscriptions" | "items">(
+    initialTab
+  );
+
+  return (
+    <Tabs
+      value={activeTab}
+      onValueChange={(value) => setActiveTab(value as typeof activeTab)}
+      className="space-y-6"
+    >
+      <TabsList>
+        <TabsTrigger value="overview">Visão Geral</TabsTrigger>
+        <TabsTrigger value="subscriptions">Assinaturas & Permissões</TabsTrigger>
+        <TabsTrigger value="items">Gerenciamento de Itens</TabsTrigger>
+      </TabsList>
+
+      <TabsContent value="overview" className="space-y-4">
+        <Card>
+          <CardHeader>
+            <CardTitle>Bem-vindo, {adminUser?.username ?? "Administrador"}</CardTitle>
+          </CardHeader>
+          <CardContent className="space-y-3 text-sm text-muted-foreground">
+            <p>
+              Utilize as abas acima para administrar planos de assinatura, permissões
+              e a curadoria de itens do marketplace. Esta área é exclusiva para
+              operadores autorizados.
+            </p>
+            <p>
+              Para solicitações críticas, lembre-se de registrar mudanças e validar
+              com a equipe responsável antes de disponibilizar aos usuários finais.
+            </p>
+          </CardContent>
+        </Card>
+      </TabsContent>
+
+      <TabsContent value="subscriptions">
+        <AdminSubscriptionTab initialTiers={initialTiers} adminUser={adminUser} />
+      </TabsContent>
+
+      <TabsContent value="items">
+        <AdminItemManager initialData={itemsData} />
+      </TabsContent>
+    </Tabs>
+  );
+}
+