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>
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