feat: [US-016] - Admin - invite new user

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/admin/invite/page.tsx

@@ -0,0 +1,41 @@
+import { redirect } from 'next/navigation'
+import { createClient } from '@/lib/supabase/server'
+import InviteForm from './InviteForm'
+
+export default async function AdminInvitePage() {
+  const supabase = await createClient()
+
+  const { data: { user } } = await supabase.auth.getUser()
+
+  if (!user) {
+    redirect('/login')
+  }
+
+  // Check if user is admin
+  const { data: profile } = await supabase
+    .from('profiles')
+    .select('is_admin')
+    .eq('id', user.id)
+    .single()
+
+  if (!profile?.is_admin) {
+    redirect('/dashboard')
+  }
+
+  return (
+    <div className="min-h-screen bg-zinc-50 dark:bg-zinc-950">
+      <div className="mx-auto max-w-2xl px-4 py-8 sm:px-6 lg:px-8">
+        <div className="mb-8">
+          <h1 className="text-2xl font-bold text-zinc-900 dark:text-zinc-50">
+            Invite New User
+          </h1>
+          <p className="mt-2 text-sm text-zinc-600 dark:text-zinc-400">
+            Send an invitation email to a new user to give them access to WebVNWrite.
+          </p>
+        </div>
+
+        <InviteForm />
+      </div>
+    </div>
+  )
+}