docs(paperless): document Office ingestion support

Document Paperless Tika/Gotenberg sidecars, supported Office/OpenDocument ingestion formats, stack paths, validation/deploy procedure, and verification commands. Updates service inventory and architecture overview so PD docs match the deployed documents stack.

docs/architecture/ARCHITECTURE_OVERVIEW.md

@@ -41,7 +41,7 @@ Full homelab stack as of 2026-05-09. All 6 expansion phases are complete and dep
 
 ### Productivity Layer
 - **Immich** (2283) — photo management; library on Serenity NFS
-- **Paperless-NGX** (8083) — document management
+- **Paperless-NGX** (8083) — document management; uses internal Tika + Gotenberg sidecars for Office/OpenDocument text extraction and conversion
 - **Karakeep** (3100) — bookmarks / read-later
 - **n8n** (5678) — workflow automation
 - **KitchenOwl** (8086), **DoneTick** (2021) — household and task management

docs/architecture/SERVICES_DIRECTORY.md

@@ -55,7 +55,7 @@ All homelab services, their hosts, ports, and current status.
 | Service | Port | Status |
 |---------|------|--------|
 | Immich | 2283 | ✅ Active |
-| Paperless-NGX | 8083 | ✅ Active |
+| Paperless-NGX | 8083 | ✅ Active; DOCX/Office ingestion via internal Tika + Gotenberg sidecars |
 | Karakeep | 3100 | ✅ Active |
 | n8n | 5678 | ✅ Active |
 | KitchenOwl | 8086 | ✅ Active |