feat(shared): add shared module with domain primitives, infrastructure services, and utils

Domain primitives: BaseEntity, AggregateRoot, ValueObject, DomainEvent, Result<T,E>
Infrastructure: PrismaService, RedisService, LoggerService (pino), EventBusService
Utils: Vietnam phone validator/normalizer, VND currency formatter, Vietnamese slug generator
Includes 45 unit tests covering all domain primitives, validators, and formatters.

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

apps/api/src/modules/shared/infrastructure/index.ts

@@ -0,0 +1,4 @@
+export { PrismaService } from './prisma.service';
+export { RedisService } from './redis.service';
+export { LoggerService } from './logger.service';
+export { EventBusService } from './event-bus.service';