feat(auth): add Keycloak JWT authentication and role-based authorization
- Configure JWT Bearer authentication with Keycloak realm integration
- Create ClubRoleClaimsTransformation to parse 'clubs' claim and add ASP.NET roles
- Add authorization policies: RequireAdmin, RequireManager, RequireMember, RequireViewer
- Add health check endpoints (/health/live, /health/ready, /health/startup)
- Add integration tests for authorization (TDD approach - tests written first)
- Configure middleware order: Authentication → MultiTenant → Authorization
- Add Keycloak configuration to appsettings.Development.json
- Add AspNetCore.HealthChecks.NpgSql v9.0.0 package
TDD Verification:
- Tests initially FAILED (expected before implementation) ✓
- Implementation complete but blocked by Task 8 Infrastructure errors
- Cannot verify tests PASS until Finbuckle.MultiTenant types resolve
Security Notes:
- RequireHttpsMetadata=false for dev only (MUST be true in production)
- Claims transformation maps Keycloak roles (lowercase) to ASP.NET roles (PascalCase)
- Health endpoints are public by default (no authentication required)
Blockers:
- Infrastructure project has Finbuckle.MultiTenant type resolution errors from Task 8
- Tests cannot execute until TenantProvider compilation errors are fixed
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