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/lib/db/schema/relations.ts

@@ -86,6 +86,7 @@ import {
   customFieldDefinitions,
   customFieldValues,
 } from './system';
+import { residentialClients, residentialInterests } from './residential';
 
 // ─── Ports ────────────────────────────────────────────────────────────────────
 
@@ -116,6 +117,8 @@ export const portsRelations = relations(ports, ({ many }) => ({
   savedViews: many(savedViews),
   userNotificationPreferences: many(userNotificationPreferences),
   customFieldDefinitions: many(customFieldDefinitions),
+  residentialClients: many(residentialClients),
+  residentialInterests: many(residentialInterests),
   berthMaintenanceLogs: many(berthMaintenanceLog),
   clientMergeLogs: many(clientMergeLog),
   clientRelationships: many(clientRelationships),
@@ -819,3 +822,24 @@ export const customFieldValuesRelations = relations(customFieldValues, ({ one })
     references: [customFieldDefinitions.id],
   }),
 }));
+
+// ─── Residential ──────────────────────────────────────────────────────────────
+
+export const residentialClientsRelations = relations(residentialClients, ({ one, many }) => ({
+  port: one(ports, {
+    fields: [residentialClients.portId],
+    references: [ports.id],
+  }),
+  interests: many(residentialInterests),
+}));
+
+export const residentialInterestsRelations = relations(residentialInterests, ({ one }) => ({
+  port: one(ports, {
+    fields: [residentialInterests.portId],
+    references: [ports.id],
+  }),
+  client: one(residentialClients, {
+    fields: [residentialInterests.residentialClientId],
+    references: [residentialClients.id],
+  }),
+}));