feat(platform): residential module + admin UI + reliability fixes

Residential platform
- New schema: residentialClients, residentialInterests (separate from
  marina/yacht clients) with migration 0010
- Service layer with CRUD + audit + sockets + per-port portal toggle
- v1 + public API routes (/api/v1/residential/*, /api/public/residential-inquiries)
- List + detail pages with inline editing for clients and interests
- Per-user residentialAccess toggle on userPortRoles (migration 0011)
- Permission keys: residential_clients, residential_interests
- Sidebar nav + role form integration
- Smoke spec covering page loads, UI create flow, public endpoint

Admin & shared UI
- Admin → Forms (form templates CRUD) with validators + service
- Notification preferences page (in-app + email per type)
- Email composition + accounts list + threads view
- Branded auth shell shared across CRM + portal auth surfaces
- Inline editing extended to yacht/company/interest detail pages
- InlineTagEditor + per-entity tags endpoints (yachts, companies)
- Notes service polymorphic across clients/interests/yachts/companies
- Client list columns: yachtCount + companyCount badges
- Reservation file-download via presigned URL (replaces stale <a href>)

Route handler refactor
- Extracted yachts/companies/berths reservation handlers to sibling
  handlers.ts files (Next.js 15 route.ts only allows specific exports)

Reliability fixes
- apiFetch double-stringify bug fixed across 13 components
  (apiFetch already JSON.stringifies its body; passing a stringified
  body produced double-encoded JSON which failed zod validation)
- SocketProvider gated behind useSyncExternalStore-based mount check
  to avoid useSession() SSR crashes under React 19 + Next 15
- apiFetch falls back to URL-pathname → port-id resolution when the
  Zustand store hasn't hydrated yet (fresh contexts, e2e tests)
- CRM invite flow (schema, service, route, email, dev script)
- Dashboard route → [portSlug]/dashboard/page.tsx + redirect
- Document the dev-server restart-after-migration gotcha in CLAUDE.md

Tests
- 5-case residential smoke spec
- Integration test updates for new service signatures

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/clients/client-columns.tsx

@@ -22,6 +22,8 @@ export interface ClientRow {
   source: string | null;
   archivedAt: string | null;
   createdAt: string;
+  yachtCount?: number;
+  companyCount?: number;
   contacts?: Array<{ channel: string; value: string; isPrimary: boolean }>;
   tags?: Array<{ id: string; name: string; color: string }>;
 }
@@ -39,10 +41,6 @@ interface GetColumnsOptions {
   onArchive: (client: ClientRow) => void;
 }
 
-// TODO: Add "Yachts" (count) and "Primary company" columns once the
-// GET /api/v1/clients list endpoint joins owned-yachts and primary-company
-// data into the row shape. Until then, the columns are omitted rather than
-// shown as empty placeholders.
 export function getClientColumns({
   portSlug,
   onEdit,
@@ -100,6 +98,36 @@ export function getClientColumns({
         );
       },
     },
+    {
+      id: 'yachtCount',
+      header: 'Yachts',
+      enableSorting: false,
+      cell: ({ row }) => {
+        const c = row.original.yachtCount ?? 0;
+        return c === 0 ? (
+          <span className="text-muted-foreground">—</span>
+        ) : (
+          <Badge variant="secondary" className="text-xs">
+            {c}
+          </Badge>
+        );
+      },
+    },
+    {
+      id: 'companyCount',
+      header: 'Companies',
+      enableSorting: false,
+      cell: ({ row }) => {
+        const c = row.original.companyCount ?? 0;
+        return c === 0 ? (
+          <span className="text-muted-foreground">—</span>
+        ) : (
+          <Badge variant="secondary" className="text-xs">
+            {c}
+          </Badge>
+        );
+      },
+    },
     {
       id: 'tags',
       header: 'Tags',