feat(agents): add public agent profile page at /agents/[id]

Implements a public-facing agent profile page with:
- Backend: new GET /agents/:agentId/profile public API endpoint with
  agent info, active listings, quality score, and review stats
- Frontend: server-rendered profile page with generateMetadata for SEO,
  JSON-LD structured data (RealEstateAgent schema), breadcrumbs
- Agent profile displays bio, service areas, quality score gauge,
  active listing cards, reviews with star ratings, and contact CTA
- Mobile responsive layout with sticky contact sidebar on desktop
- Vietnamese UI text throughout, consistent with existing patterns

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

apps/api/src/modules/agents/application/queries/get-agent-public-profile/get-agent-public-profile.handler.ts

@@ -0,0 +1,24 @@
+import { Inject } from '@nestjs/common';
+import { type IQueryHandler, QueryHandler } from '@nestjs/cqrs';
+import {
+  AGENT_REPOSITORY,
+  type AgentPublicProfileData,
+  type IAgentRepository,
+} from '../../../domain/repositories/agent.repository';
+import { GetAgentPublicProfileQuery } from './get-agent-public-profile.query';
+
+@QueryHandler(GetAgentPublicProfileQuery)
+export class GetAgentPublicProfileHandler
+  implements IQueryHandler<GetAgentPublicProfileQuery>
+{
+  constructor(
+    @Inject(AGENT_REPOSITORY)
+    private readonly agentRepo: IAgentRepository,
+  ) {}
+
+  async execute(
+    query: GetAgentPublicProfileQuery,
+  ): Promise<AgentPublicProfileData | null> {
+    return this.agentRepo.getPublicProfile(query.agentId);
+  }
+}

apps/api/src/modules/agents/application/queries/get-agent-public-profile/get-agent-public-profile.query.ts

@@ -0,0 +1,3 @@
+export class GetAgentPublicProfileQuery {
+  constructor(public readonly agentId: string) {}
+}