tasks(books-vds-stacks-to-portainer): Phase 0 probe complete, +imgproxy scope

Phase 0 findings:
- 6 target stacks (5 original + imgproxy discovered on /usr/docker/imgproxy/)
- All bind-only, no env_file, no surprise named volumes
- Portainer PAT works via X-API-Key; endpoint 1 = books VDS, endpoint 6 = stostayer (not ours, user-confirmed)
- mongo container lost image tag (digest only) — fresh mongo:4.2 pull at recreate acceptable
- Q1 (endpoint 6) + Q2 (volume preservation) closed

Updated entity books-vds: imgproxy added to SSH-managed inventory (was missing).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/entities/books-vds.md

@@ -54,7 +54,8 @@ Single root partition, нет отдельной `/data`. Docker hub data под
 | `/usr/docker/elasticsearch/` | elasticsearch | `./data` + `./snapshots` (added 2026-05-25) |
 | `/usr/docker/traefik/` | traefik | `./letsencrypt` (acme.json) + `./data/traefik.yml` |
 | `/usr/docker/portainer/` | portainer | named volume `portainer_data` |
-| `/usr/docker/proxy-chain/` | proxy-chain | upstream HTTP-proxy chain |
+| `/usr/docker/proxy-chain/` | proxy-chain | `./config` (upstream HTTP-proxy chain) |
+| `/usr/docker/imgproxy/` | imgproxy + imgproxy-nginx | `./nginx/cache` + `./nginx/nginx.conf` (serves `imgproxy.kzntsv.site`, S3 backend via minio) |
 
 **TODO**: мигрировать максимум SSH-managed контейнеров под Portainer (отдельная таска после backup-pipeline live). Cause: разделённое управление обламывает CI (Portainer-only deploy.yml) и debugging.