chore: move business tooling out of the public library; tidy filestore naming

Keep the public tree project-generic. Business/one-off tools, deployment
and business docs move to the private oo-workspace repo.

Moved to oo-workspace:
- cmd/ooscan, cmd/pdfamount, cmd/kontoblatt, cmd/kontolink
- internal/xlspipe (cutover-portugal workbook) -> oow workbook build
  (drops the --template/--title flags from oo docs put-xlsx)
- deploy/docker-compose.rclone-webdav.yml + docs/rclone-webdav.md
- docs/crm-associations.md

Removed GitHub-era leftovers:
- .github/workflows/release-please.yml, release-please-config.json,
  .release-please-manifest.json (tags are created on Gitea per SemVer)

Naming: the FileStore subsystem is now filestore_*.go (was file_*.go) to
match files_*.go (project Documents). Docs/AGENTS/README updated.

docs/README.md

@@ -18,10 +18,7 @@ related:
 - [elasticsearch.md](elasticsearch.md) — поиск: индекс OnlyOffice `files_file`
   и свой `oo_docs_text` (PDF/сканы), туннель.
 - [index-and-search.md](index-and-search.md) — карта контуров поиска и как
-  обновлять индексы (`oo index`, `ooscan`/`pdfamount` для match).
-- [rclone-webdav.md](rclone-webdav.md) — rclone-монтирование Documents
-  (`deploy/docker-compose.rclone-webdav.yml`), smoke, ограничения.
-- [crm-associations.md](crm-associations.md) — правила ассоциаций CRM.
+  обновлять индексы (`oo index`, `oo search`).
 - [rate-limiting.md](rate-limiting.md) — rate limit, exponential backoff,
   `Retry-After`, общий cooldown против 429; env `OO_RATE_LIMIT`/`OO_BURST`/
   `OO_RETRY_*`.