- Profile view/edit (personal info + emergency contact)
- Photo upload for profile and participant (multipart, 5MB max)
- Branch locator endpoint (coordinates, operating hours, phone)
- Health check endpoint (GET /health — no DB, instant response)
- API response headers middleware (X-Request-Id, X-Api-Version)
- Feature test suite: 17 tests covering auth, public access, rate
  limiting, and validation across all endpoint groups
- 53 total API endpoints
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>