feat(team-member): Complete Team Member Management capability

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

backend/Dockerfile

@@ -28,6 +28,12 @@ COPY . .
 # Install PHP dependencies
 RUN composer install --no-interaction --optimize-autoloader
 
+# Install Laravel Boost
+RUN php artisan boost:install
+RUN php artisan vendor:publish --provider="Laravel\Boost\BoostServiceProvider"
+RUN php artisan config:clear
+RUN composer dump-autoload
+
 # Set permissions
 RUN chmod -R 755 /var/www/html/storage