paperless-mcp: deploy MCP for AI document search

- New stack `paperless-mcp` running barryw/PaperlessMCP v0.1.19 (.NET,
  HTTP+SSE on :5000) wraps paperless-ngx's built-in FTS. 43 tools exposed.
- In-cluster only egress to paperless-ngx svc; no Cloudflare hop on
  MCP-internal traffic.
- Read-only at paperless layer: dedicated `claude-mcp` user (non-superuser)
  in new `claude-mcp-readers` group with view-only Django perms; existing
  279 docs bulk-granted view perm via /api/documents/bulk_edit/;
  workflow #2 auto-grants the group on new docs (Consumption Added).
- Gateway-level bearer auth via new Traefik plugin
  Aetherinox/traefik-api-token-middleware@v0.1.4 (loaded in traefik stack
  alongside crowdsec-bouncer); per-stack Middleware CRD `bearer-auth`
  pulls token list from Vault `secret/paperless-mcp/bearer_tokens`.
- Vault `secret/paperless-mcp` holds: paperless_api_token (synced to
  K8s Secret via ESO; pod env via secret_key_ref), bearer_tokens
  (JSON array, read at plan time), bearer_token_viktor_laptop (mirror
  for laptop wiring), paperless_user_password (paperless UI fallback).
- Image auto-update via Keel (semver minor policy, hourly poll).
- Ingress dns_type=proxied → Uptime Kuma external monitor auto-created
  by external-monitor-sync CronJob.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

stacks/paperless-mcp/secrets

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