fix(registratura): remove intern direction — only intrat/iesit are valid

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/modules/registratura/services/reserved-slots-service.ts

@@ -6,7 +6,7 @@
  *   - end-of-month (~last day, snapped to nearest previous working day)
  *
  * Slots use the IN sequence by default. When a late IN document arrives,
- * it claims the slot's number. OUT/INT docs get new typed numbers instead.
+ * it claims the slot's number. OUT docs get new typed numbers instead.
  */
 
 import { v4 as uuid } from "uuid";