feat(addresses): full CRUD UI for client + company multi-address

Client and company detail pages each gain an Addresses tab with click-to-edit
fields wired to the existing CountryCombobox/SubdivisionCombobox primitives.
Adds a primary toggle that demotes the previous primary inside one transaction
so the partial unique index never trips.

- New service helpers: list/add/update/remove ClientAddress + CompanyAddress
- New routes: /api/v1/clients/[id]/addresses[/addressId], same under companies/
- New shared component: <AddressesEditor> reused by both detail surfaces
- Integration tests cover happy path, primary demotion, and tenant scoping

Tests: 747/747 vitest (was 741, +6 address tests).

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

src/components/clients/client-detail.tsx

@@ -7,6 +7,7 @@ import { ClientDetailHeader } from '@/components/clients/client-detail-header';
 import { getClientTabs } from '@/components/clients/client-tabs';
 import { useRealtimeInvalidation } from '@/hooks/use-realtime-invalidation';
 import { apiFetch } from '@/lib/api/client';
+import type { Address } from '@/components/shared/addresses-editor';
 
 interface ClientData {
   id: string;
@@ -64,6 +65,7 @@ interface ClientData {
     tenureType: string;
     status: string;
   }>;
+  addresses: Address[];
 }
 
 interface ClientDetailProps {

src/components/clients/client-tabs.tsx

@@ -13,6 +13,7 @@ import { ClientYachtsTab } from '@/components/clients/client-yachts-tab';
 import { ClientCompaniesTab } from '@/components/clients/client-companies-tab';
 import { ClientReservationsTab } from '@/components/clients/client-reservations-tab';
 import { ContactsEditor } from '@/components/clients/contacts-editor';
+import { AddressesEditor, type Address } from '@/components/shared/addresses-editor';
 import { apiFetch } from '@/lib/api/client';
 
 type ClientPatchField =
@@ -83,6 +84,7 @@ interface ClientTabsOptions {
       label?: string | null;
       isPrimary: boolean;
     }>;
+    addresses?: Address[];
     yachts: Array<{
       id: string;
       name: string;
@@ -237,6 +239,18 @@ export function getClientTabs({ clientId, currentUserId, client }: ClientTabsOpt
         <ClientReservationsTab clientId={clientId} activeReservations={client.activeReservations} />
       ),
     },
+    {
+      id: 'addresses',
+      label: 'Addresses',
+      badge: client.addresses?.length ?? 0,
+      content: (
+        <AddressesEditor
+          endpoint={`/api/v1/clients/${clientId}/addresses`}
+          invalidateKey={['clients', clientId]}
+          addresses={client.addresses ?? []}
+        />
+      ),
+    },
     {
       id: 'interests',
       label: 'Interests',