feat(shared): add error handling & structured logging strategy

- Global exception filter with consistent error response format
- Domain exceptions (NotFoundException, ValidationException, etc.)
- Error codes enum for domain-specific error identification
- Correlation ID middleware for request tracing
- Request/response logging middleware with structured JSON
- PII masking in logs (emails, phone numbers, sensitive fields)
- Enhanced LoggerService with pino formatters and ISO timestamps
- Tests for exception filter, domain exceptions, and PII masker

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

apps/api/src/main.ts

@@ -1,11 +1,15 @@
 import { NestFactory } from '@nestjs/core';
+import { LoggerService } from '@modules/shared';
 import { AppModule } from './app.module';
 
 async function bootstrap() {
-  const app = await NestFactory.create(AppModule);
+  const app = await NestFactory.create(AppModule, { bufferLogs: true });
+  const logger = app.get(LoggerService);
+  app.useLogger(logger);
+
   const port = process.env['PORT'] ?? 3001;
   await app.listen(port);
-  console.log(`API running on http://localhost:${port}`);
+  logger.log(`API running on http://localhost:${port}`, 'Bootstrap');
 }
 
 bootstrap();