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/companies/company-detail.tsx

@@ -8,6 +8,7 @@ import { CompanyDetailHeader } from '@/components/companies/company-detail-heade
 import { getCompanyTabs } from '@/components/companies/company-tabs';
 import { useRealtimeInvalidation } from '@/hooks/use-realtime-invalidation';
 import { apiFetch } from '@/lib/api/client';
+import type { Address } from '@/components/shared/addresses-editor';
 
 export interface CompanyData {
   id: string;
@@ -25,6 +26,8 @@ export interface CompanyData {
   archivedAt: string | null;
   createdAt: string;
   updatedAt: string;
+  tags?: Array<{ id: string; name: string; color: string }>;
+  addresses?: Address[];
 }
 
 interface CompanyDetailProps {

src/components/companies/company-tabs.tsx

@@ -11,6 +11,7 @@ import { InlineTagEditor } from '@/components/shared/inline-tag-editor';
 import { NotesList } from '@/components/shared/notes-list';
 import { CompanyMembersTab } from '@/components/companies/company-members-tab';
 import { CompanyOwnedYachtsTab } from '@/components/companies/company-owned-yachts-tab';
+import { AddressesEditor, type Address } from '@/components/shared/addresses-editor';
 import { apiFetch } from '@/lib/api/client';
 import type { CountryCode } from '@/lib/i18n/countries';
 
@@ -45,6 +46,7 @@ interface CompanyTabsCompany {
   billingEmail: string | null;
   notes: string | null;
   tags?: Array<{ id: string; name: string; color: string }>;
+  addresses?: Address[];
 }
 
 interface CompanyTabsOptions {
@@ -211,10 +213,12 @@ export function getCompanyTabs({
     {
       id: 'addresses',
       label: 'Addresses',
+      badge: company.addresses?.length ?? 0,
       content: (
-        <EmptyState
-          title="Addresses"
-          description="Company addresses coming soon — the addresses endpoint is pending wiring."
+        <AddressesEditor
+          endpoint={`/api/v1/companies/${companyId}/addresses`}
+          invalidateKey={['companies', companyId]}
+          addresses={company.addresses ?? []}
         />
       ),
     },