feat(inquiries): top-level Inquiries page (list + detail + convert), nav entries; retire admin inbox

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app/(dashboard)/[portSlug]/admin/inquiries/page.tsx

@@ -1,5 +1,15 @@
-import { InquiryInbox } from '@/components/admin/inquiry-inbox';
+import { redirect } from 'next/navigation';
 
-export default function InquiriesPage() {
-  return <InquiryInbox />;
+/**
+ * The inquiry inbox is now a top-level, permission-gated page at
+ * `/[portSlug]/inquiries` (resource `inquiries`), no longer admin-only.
+ * Redirect the legacy admin URL so old bookmarks/links still land.
+ */
+interface AdminInquiriesRedirectProps {
+  params: Promise<{ portSlug: string }>;
+}
+
+export default async function AdminInquiriesRedirect({ params }: AdminInquiriesRedirectProps) {
+  const { portSlug } = await params;
+  redirect(`/${portSlug}/inquiries`);
 }