feat(auth): add handler specs and improve auth infrastructure

Add unit tests for get-profile, get-agent-by-user-id, and verify-kyc handlers.
Improve OAuth service, local strategy, and repository implementations with
proper ConfigService injection and error handling.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/auth/domain/events/agent-verified.event.ts

@@ -1,4 +1,4 @@
-import { type DomainEvent } from '@modules/shared/domain/domain-event';
+import { type DomainEvent } from '@modules/shared';
 
 export class AgentVerifiedEvent implements DomainEvent {
   readonly eventName = 'agent.verified';

apps/api/src/modules/auth/domain/events/user-registered.event.ts

@@ -1,5 +1,5 @@
 import { type UserRole } from '@prisma/client';
-import { type DomainEvent } from '@modules/shared/domain/domain-event';
+import { type DomainEvent } from '@modules/shared';
 
 export class UserRegisteredEvent implements DomainEvent {
   readonly eventName = 'user.registered';