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.

documents/README.md

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+# Documents Stack
+
+Docker Compose stack for document and knowledge-capture services on PD.
+
+## Paperless-NGX
+
+- URL: `https://paperless.paccoco.com` / `http://pd:8083`
+- Compose service: `paperless`
+- Appdata: `/mnt/docker-ssd/docker/appdata/paperless/`
+- Consume folder: `/mnt/unraid/data/paperless/consume` → `/usr/src/paperless/consume`
+- Database: shared Postgres on `ix-databases_shared-databases`
+- Redis: shared Redis via `PAPERLESS_REDIS`
+
+Paperless has internal-only Tika and Gotenberg sidecars for Office/OpenDocument ingestion:
+
+- `tika` (`apache/tika`) at `http://tika:9998`, memory limit `512m`
+- `gotenberg` (`gotenberg/gotenberg`) at `http://gotenberg:3000`, memory limit `256m`
+- Both sidecars live only on `documents_paperless_internal` and expose no host ports.
+
+Required Paperless Tika env keys:
+
+```env
+PAPERLESS_TIKA_ENABLED=1
+PAPERLESS_TIKA_ENDPOINT=http://tika:9998
+PAPERLESS_TIKA_GOTENBERG_ENDPOINT=http://gotenberg:3000
+```
+
+Supported additional ingestion types include `.docx`, `.doc`, `.pptx`, `.xlsx`, and OpenDocument formats (`.odt`, `.ods`, `.odp`) in addition to the existing PDF/image OCR path.
+
+## Deploy
+
+From `/mnt/docker-ssd/docker/compose/documents` on PD:
+
+```bash
+docker compose --env-file .env config
+docker compose --env-file .env down && docker compose --env-file .env up -d
+```
+
+Do not restart Docker on PD; use stack-level compose commands only.