Implement full CRUD operations for team members with TDD approach:
Backend:
- TeamMemberController with REST API endpoints
- TeamMemberService for business logic extraction
- TeamMemberPolicy for authorization (superuser/manager access)
- 14 tests passing (8 API, 6 unit tests)
Frontend:
- Team member list with search and status filter
- Create/Edit modal with form validation
- Delete confirmation with constraint checking
- Currency formatting for hourly rates
- Real API integration with teamMemberService
Tests:
- E2E tests fixed with seed data helper
- All 157 tests passing (backend + frontend + E2E)
Closes#22
