feat(web): add Privacy Policy and Terms of Service pages

- Create /chinh-sach-bao-mat (Privacy Policy) with 10 sections
- Create /dieu-khoan-su-dung (Terms of Service) with 11 sections
- Add legal link group to footer (vi + en i18n)
- Add legalLinks prop to Footer for bottom-bar display
- Wire links into public layout

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/agents/domain/events/broker-cert-status-changed.event.ts

@@ -0,0 +1,13 @@
+import { type DomainEvent } from '@modules/shared';
+
+export class BrokerCertStatusChangedEvent implements DomainEvent {
+  readonly eventName = 'agent.broker_cert_status_changed';
+  readonly occurredAt = new Date();
+
+  constructor(
+    public readonly aggregateId: string,
+    public readonly previousStatus: string,
+    public readonly newStatus: string,
+    public readonly certExpiryAt: Date | null,
+  ) {}
+}