feat(retire): drop using-synology-ops skill — NAS decommissioned

Synology NAS permanently retired 2026-05-25. Removing dead-code:

- skills/using-synology-ops/ — source deleted
- dist-hermes/mcp/using-synology-ops/ — built artifact deleted
- hermes/mapping.yaml — entry removed
- skills/using-vds-ops/SKILL.md — stripped NAS-disambiguation
  clause from description + "Mirror of using-synology-ops" line
  from body; bumped 0.1.0 → 0.1.1 PATCH (wording cleanup post-
  retirement, no capability change)

Out of repo (user-config side, manual follow-up):
- ~/.claude/skills/using-synology-ops/ install dir
- ~/.claude.json mcp.synology-ops server entry (dead URL +
  bearer token, must drop)
- C:/Users/vitya/projects/synology-ops-mcp/ source repo —
  separate decision, out of this scope

hermes/mapping.yaml

@@ -126,10 +126,6 @@ skills:
     mode: auto
     category: mcp
 
-  using-synology-ops:
-    mode: auto
-    category: mcp
-
   project-bootstrap:
     mode: auto
     category: software-development