0e503176c4
Add complete domain events dispatching infrastructure and critical event handlers for Identity module. Changes: - Added IMediator injection to IdentityDbContext - Implemented SaveChangesAsync override to dispatch domain events before persisting - Made DomainEvent base class implement INotification (added MediatR.Contracts dependency) - Created 3 new domain events: UserRoleAssignedEvent, UserRemovedFromTenantEvent, UserLoggedInEvent - Implemented 4 event handlers with structured logging: - UserRoleAssignedEventHandler (audit log, cache invalidation placeholder) - UserRemovedFromTenantEventHandler (notification placeholder) - UserLoggedInEventHandler (login tracking placeholder) - TenantCreatedEventHandler (welcome email placeholder) - Updated unit tests to inject mock IMediator into IdentityDbContext Technical Details: - Domain events are now published via MediatR within the same transaction - Events are dispatched BEFORE SaveChangesAsync to ensure atomicity - Event handlers auto-registered by MediatR assembly scanning - All handlers include structured logging for observability Next Steps (Phase 3): - Update command handlers to raise new events (UserLoggedInEvent, UserRoleAssignedEvent) - Add event raising logic to User/Tenant aggregates - Implement audit logging persistence (currently just logging) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>