feat(residential-toggle): port-level module gate for Residential

Adds a `residential_module_enabled` port setting (default ON) that
hides/disables the entire Residential surface when an admin turns it
off, mirroring the Tenancies / Invoices / Expenses module-toggle
pattern. Disabling is a soft hide — residential clients/interests are
preserved and reappear on re-enable.

Surfaces gated:
- Route guard: new residential/layout.tsx renders ModuleDisabledPage
  (covers all 5 residential pages)
- Sidebar "Residential" section + mobile more-sheet tile (SSR-resolved
  residentialModuleByPort threaded layout → app-shell → sidebar)
- Global search: residential client/interest buckets early-return at
  the shared chokepoint so disabled-port records don't dead-end
- Public intake: /api/public/residential-inquiries 404s when off
- Admin Switch in settings-manager (writes via settings PUT)

Service TDD'd (residential-module.test.ts, 6 tests) plus a
disabled-port rejection test on the public endpoint. tsc + lint clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/layout/mobile/more-sheet.tsx

@@ -81,9 +81,14 @@ const MORE_GROUPS: MoreGroup[] = [
 export function MoreSheet({
   open,
   onOpenChange,
+  residentialModuleEnabled = true,
 }: {
   open: boolean;
   onOpenChange: (next: boolean) => void;
+  /** Per-port residential-module gate, resolved SSR-side in the shell.
+   *  Hides the Residential tile when the module is off. Defaults to true
+   *  so a missing value keeps the feature visible (registry default). */
+  residentialModuleEnabled?: boolean;
 }) {
   const pathname = usePathname();
   const portSlug = pathname.split('/').filter(Boolean)[0] ?? 'port-nimara';
@@ -98,6 +103,7 @@ export function MoreSheet({
     ...g,
     items: g.items.filter((item) => {
       if (item.segment === 'website-analytics') return umamiConfigured;
+      if (item.segment === 'residential/clients') return residentialModuleEnabled;
       return true;
     }),
   })).filter((g) => g.items.length > 0);