feat(registratura): rework with company-prefixed numbering, directions, deadlines, attachments

- Company-specific numbering (B-0001/2026, US-0001/2026, SDT-0001/2026)
- Direction: Intrat/Ieșit replaces old 3-way type
- 9 document types: Contract, Ofertă, Factură, Scrisoare, etc.
- Status simplified to Deschis/Închis with cascade close for linked entries
- Address Book autocomplete for sender/recipient
- Deadline tracking with overdue day counter
- File attachment support (base64 encoding)
- Linked entries system

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

src/modules/registratura/index.ts

@@ -1,3 +1,3 @@
 export { registraturaConfig } from './config';
 export { RegistraturaModule } from './components/registratura-module';
-export type { RegistryEntry, RegistryEntryType, RegistryEntryStatus } from './types';
+export type { RegistryEntry, RegistryDirection, RegistryStatus, DocumentType } from './types';