New page at /admin/system-info with three tabs:
- Overview: PHP version, SAPI, environment, 6 health checks (DB, schema,
storage, RBAC baseline, admin role, scheduler heartbeat)
- Modules: table of active modules with version, dependencies, permission count
- Permissions: active/inactive counts and per-source breakdown
Gated behind new system_info.view permission assigned to Admin role.
No mutations — purely diagnostic/observability.
Includes SystemHealthService, SystemInfoService, SystemHealthRepository
with interface, DI registration, i18n keys (de+en), idempotent DB update
script, and 17 new PHPUnit tests.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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