feat: relocate import tools into studio and harden catalog/furnidata integrity

- Move /admin/import/* tools under /admin/studio/* and add studio nav, layout and tabs
- Add shared catalog maintenance panel plus a /admin/studio/maintenance tab
- Make furnidata reconciliation overwrite conflicting entries with the
  DB-authoritative items_base classname/id (surfaced via fixedConflicts)
- Add furnidata_translate_enabled setting to skip the heavy localized
  furnidata build during import (manual build-languages still forces it)
- Update staff smoke contract test for the studio hub

next.config.ts

@@ -38,6 +38,68 @@ const nextConfig: NextConfig = {
 	deploymentId: resolveDeploymentId(),
 	serverExternalPackages: ["lzma", "sharp", "pino", "pino-pretty"],
 
+	// The /admin/import hub was consolidated into the catalogue studio at
+	// /admin/studio. Redirect the old routes so bookmarks/links don't 404.
+	async redirects() {
+		return [
+			{
+				source: "/admin/import",
+				destination: "/admin/studio/furni",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/badges",
+				destination: "/admin/studio/badges",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/furni",
+				destination: "/admin/studio/furni",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/furni/upload",
+				destination: "/admin/studio/upload",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/clothing",
+				destination: "/admin/studio/clothing",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/effects",
+				destination: "/admin/studio/effects",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/pets",
+				destination: "/admin/studio/pets",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/clone",
+				destination: "/admin/studio/clone",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/sync",
+				destination: "/admin/studio/sync",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/repair-icons",
+				destination: "/admin/studio/repair-icons",
+				permanent: true,
+			},
+			{
+				source: "/admin/import/audit",
+				destination: "/admin/studio/audit",
+				permanent: true,
+			},
+		];
+	},
+
 	// Silence Turbopack warnings for the broad file patterns in src/lib.
 	turbopack: {
 		ignoreIssue: [