add client/admin pages, show info and created admin api and server actions

app/[locale]/(protected)/cabinet/admin/page.tsx

@@ -0,0 +1,68 @@
+'use client'
+
+import { Card, CardContent, CardHeader } from '@/components/ui/card'
+import { RoleGate } from '@/components/auth/role-gate'
+import FormSuccess from '@/components/form-success'
+import { UserRole } from '@prisma/client'
+import { Button } from '@/components/ui/button'
+import { toast } from 'sonner'
+import { admin } from '@/actions/admin'
+
+const AdminPage = () => {
+  const onServerActionClick = () => {
+    admin()
+      .then((data) => {
+        if (data.error) {
+          toast.error(data.error)
+        }
+
+        if (data.success) {
+          toast.success(data.success)
+        }
+      })
+  }
+
+  const onApiRouteClick = () => {
+    fetch('/api/admin')
+      .then((response) => {
+        if (response.ok) {
+          toast.success('Allow API Route')
+        } else {
+          toast.error('Forbidden API Route')
+        }
+      })
+  }
+
+  return (
+    <Card className="w-[600px]">
+      <CardHeader>
+        <p className="text-2xl font-semibold text-center">
+          🔑 Admin
+        </p>
+      </CardHeader>
+      <CardContent className="space-y-4">
+        <RoleGate allowedRole={UserRole.ADMIN}>
+          <FormSuccess message="You are allowed to see this content!"/>
+        </RoleGate>
+        <div className="flex flex-row justify-between items-center rounded-lg border p-3 shadow-md">
+          <p className="text-sm font-medium">
+            Admin-only API Route
+          </p>
+          <Button onClick={onApiRouteClick}>
+            Click to test
+          </Button>
+        </div>
+        <div className="flex flex-row justify-between items-center rounded-lg border p-3 shadow-md">
+          <p className="text-sm font-medium">
+            Admin-only Server Action
+          </p>
+          <Button onClick={onServerActionClick}>
+            Click to test
+          </Button>
+        </div>
+      </CardContent>
+    </Card>
+  )
+}
+
+export default AdminPage