fix: remaining lint auto-fixes and rate-limit guard test fixes

- Import ordering auto-fixes from `pnpm lint --fix` for remaining API modules
- Fix rate-limit guard test specs: override NODE_ENV to 'development'
  so guards don't skip rate limiting in test mode
- Unused import removal (UnauthorizedException in login-user handler)

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

apps/api/src/modules/shared/infrastructure/env-validation.ts

@@ -15,7 +15,7 @@ const REQUIRED_IN_PRODUCTION: readonly string[] = [
   'DATABASE_URL',
   'CORS_ORIGINS',
   'REDIS_HOST',
-  'KYC_ENCRYPTION_KEY',
+  'FIELD_ENCRYPTION_KEY',
 ];
 
 const REQUIRED_WHEN_USED: ReadonlyMap<string, string> = new Map([