Refactor AdvowareAkte ↔ CDokumente relationship from junction table to direct n:1 relationship

- Removed CAdvowareAktenCDokumente junction table and associated service.
- Updated CDokumente entity to include foreign key cAdvowareAktenId and related fields.
- Changed relationship in CDokumente from hasMany to belongsTo.
- Updated CAdvowareAkten to reflect new direct relationship.
- Implemented CDokumente service with duplicateDocument method for document duplication.
- Refactored hooks to support new relationship and document propagation.
- Removed obsolete API routes related to the junction table.
- Added i18n translations for new fields and updated tooltips.
- Document flow and auto-linking logic enhanced for better integration with Advoware.
- Validation checks passed, and no data migration needed.

custom/Espo/Custom/Services/CAdvowareAktenCDokumente.php

@@ -1,14 +0,0 @@
-<?php
-namespace Espo\Custom\Services;
-
-use Espo\Services\Record;
-
-/**
- * Junction Service: CAdvowareAkten ↔ CDokumente
- * 
- * Handles business logic for the junction table.
- */
-class CAdvowareAktenCDokumente extends Record
-{
-    // Standard CRUD logic inherited from Record service
-}