Implement remaining backend controllers for all web admin menu pages:
- SettingsController: general, notification, theme, account, API keys
- RoleController: CRUD roles with permission assignment
- PermissionController: permission matrix for RBAC management
- MetricsController: server metrics overview and per-server data
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Kong handles JWT validation at the gateway level. Service-level
AuthGuard('jwt') fails because services don't register a Passport
JWT strategy (only auth-service does). Removed from 17 controllers
across ops, inventory, monitor, comm, audit, and agent services.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>