feat(admin): unified ticket inbox over CMS and help-center queues

Merged read-model inbox at /admin/tickets and /mod/tickets with type badges and deep links; CMS-only lists moved to /desk. No DB schema merge.

Co-authored-by: Cursor <[email protected]>

src/lib/admin-nav.ts

@@ -109,9 +109,14 @@ export const ADMIN_HUBS: AdminHubDefinition[] = [
 		tabs: [
 			{
 				href: "/admin/tickets",
-				labelKey: "tickets",
+				labelKey: "ticketInbox",
 				match: ["/admin/tickets"],
 			},
+			{
+				href: "/admin/tickets/desk",
+				labelKey: "tickets",
+				match: ["/admin/tickets/desk"],
+			},
 			{
 				href: "/admin/help-tickets",
 				labelKey: "helpTickets",