feat: add event-driven audit logging

[aabrius]

Summary

• Implements domain events (EntityCreated, EntityUpdated, EntityDeleted, UserLogin, UserLogout)
• Adds AuditListener for handling events and creating audit logs
• Implements AuditSubscriber for automatic TypeORM entity auditing
• Captures actor info, IP, user agent, and request context
• Adds 44 unit tests for events, listener, and subscriber

Test plan

• Run npm test -- --testPathPattern="domain-events|audit.listener|audit.subscriber" to verify all tests pass
• Verify audit logs are created on entity changes

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 793cb77 and 4ab4ef1.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (10)

• apps/backend/package.json (2 hunks)
• apps/backend/src/app.module.ts (2 hunks)
• apps/backend/src/events/domain-events.spec.ts (1 hunks)
• apps/backend/src/events/domain-events.ts (1 hunks)
• apps/backend/src/events/events.module.ts (1 hunks)
• apps/backend/src/events/index.ts (1 hunks)
• apps/backend/src/modules/audit/audit.listener.spec.ts (1 hunks)
• apps/backend/src/modules/audit/audit.listener.ts (1 hunks)
• apps/backend/src/modules/audit/audit.module.ts (1 hunks)
• apps/backend/src/modules/audit/subscribers/audit.subscriber.spec.ts (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/event-driven-audit

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