[Feature Request] "Document Deleted" / "Document Trashed" Workflow Trigger

Summary Add a Document Deleted (and/or Document Trashed) trigger type to the Workflows system, so external integrations can react to document removal without polling. Current State Paperless-ngx workflows support four triggers: | Trigger | Available | |---|---| | Consumption Started | ✅ | | Document Added | ✅ | | Document Updated | ✅ | | Scheduled | ✅ | | Document Deleted / Trashed | ❌ | The Webhook workflow action makes it possible to keep external systems (search indexes, RAG pipelines, audit logs, downstream archives) in sync with Paperless in near-real-time — but only for additions and updates. Deletions must still be detected by polling the full document list, which undermines the event-driven model. Use Case External search / RAG index synchronization A common integration pattern: 1. Paperless consumes a document → Workflow fires → external index receives document ID via webhook → indexes the document. 2. Document metadata changes → Document Upd…