Add user settings, audit log, berth CRUD, and missing endpoints

- PATCH /api/v1/me: self-service profile update (name, phone, timezone)
- User settings page with profile editor + notification preferences
- Audit log API with filtering (entity, action, user, date range)
- Audit log page with search, entity type, and action filters
- Berth create/delete: POST /api/v1/berths + DELETE /api/v1/berths/[id]
- Client duplicates endpoint: GET /api/v1/clients/duplicates?name=
- Replace settings and audit stub pages with real implementations

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(dashboard)/[portSlug]/admin/audit/page.tsx

@@ -1,16 +1,5 @@
+import { AuditLogList } from '@/components/admin/audit/audit-log-list';
+
 export default function AuditLogPage() {
-  return (
-    <div className="space-y-6">
-      <div>
-        <h1 className="text-2xl font-bold text-foreground">Audit Log</h1>
-        <p className="text-muted-foreground">Review system activity and changes</p>
-      </div>
-      <div className="flex flex-col items-center justify-center rounded-lg border border-dashed p-12">
-        <p className="text-lg font-medium text-muted-foreground">Coming in Layer 2</p>
-        <p className="text-sm text-muted-foreground">
-          This feature will be implemented in the next phase.
-        </p>
-      </div>
-    </div>
-  );
+  return <AuditLogList />;
 }