feat: admin area with customers, users, settings, audit log, service status (phase 5)

- customer CRUD wizard backend: per-system credential shapes validated via
  connector construction, AES-256-GCM at rest, write-only over the API
- ticketing connectors (jira/azure_devops/youtrack/demo) with test-connection
- user management: roles, disable (revokes sessions), force password reset,
  delete; self-demotion/disable/delete guards
- admin-editable runtime settings ({_id:app}) incl. atomizer URL override
- audit log written on every privileged mutation + filterable list API
- service status panel: mongo/atomizer/work-performer health + latency with
  late-bound breaker, sync and jobs status providers
- tabbed admin UI (customers wizard dialog, users table, settings, status, audit)
- compose: mongo nofile ulimit 64000 (1024 default crashed WiredTiger)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

PROGRESS.md

@@ -5,3 +5,4 @@
 - Phase 2 (store layer): mongo-driver v2 connection with startup retry, §4.9 indexes idempotent, optimistic-concurrency UpdateVersioned (ErrVersionConflict/ErrNotFound), AES-256-GCM credential crypto, HMAC-signed file URL tokens (1h TTL), GridFS store with MIME sniffing + size cap + sha256, /readyz mongo check (verified 503 on stopped Mongo) — unit + integration tests green.
 - Phase 3 (auth): argon2id (PHC, spec params), login/register rate limiting, opaque Mongo sessions (30d sliding, TTL index), CSRF double-submit, bootstrap admin with forced password change, RBAC middleware + matrix tests, OIDC code flow with PKCE + email linking (verified-only), full integration suite incl. fake IdP — all green.
 - Phase 4 (base UI shell): embedded templates + static assets (no build step), §10 beige/dark tokens with radius 2px, theme toggle persisted to localStorage + profile, login/register/change-password pages, profile page (avatar upload w/ MIME check, bio, contacts, arbitrary extra fields, version-conflict 409), role-based navigation, /files/{id} serving (session or signed token), CSP without inline scripts + security headers — unit + integration tests green, stack verified live.
+- Phase 5 (admin): customer CRUD wizard with per-system encrypted credentials + test connection (jira/ado/youtrack/demo connectors), user management (roles, disable w/ session revoke, force-reset, delete, self-lockout guards), runtime settings doc, audit log on every privileged mutation + list API, service-status panel (mongo/atomizer/WP health + latency, late-bound breaker/sync/jobs providers), tabbed admin UI - tests green. Fixed mongod WT_PANIC: container nofile ulimit was 1024, raised to 64000 in compose.