refactor(system-info): reduce to Stripe-style status page

Reduce admin/system-info to a single focused status view: overall
status banner, components list from existing health checks, and an
environment meta table. Drops the Modules and Permissions tabs —
those were dev-diagnostics already available via CLI.

- Remove SystemInfoService + its test; wire the action directly to
  SystemHealthService and build meta inline
- Extend SystemHealthService with per-check label + description so
  the UI speaks in customer terms while the CLI doctor path stays
  compatible
- Rebuild the view on existing app-stats-table + app-empty-state
  primitives; add a small app-status-banner component for the
  headline signal
- Align help-center nav label and i18n keys (de/en)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/App/Container/Registrars/AppServicesRegistrar.php

@@ -41,7 +41,6 @@ use MintyPHP\Service\Security\RateLimiterService;
 use MintyPHP\Service\Security\SecurityServicesFactory;
 use MintyPHP\Service\Stats\AdminStatsViewDataService;
 use MintyPHP\Service\System\SystemHealthService;
-use MintyPHP\Service\System\SystemInfoService;
 
 final class AppServicesRegistrar implements ContainerRegistrar
 {
@@ -56,11 +55,6 @@ final class AppServicesRegistrar implements ContainerRegistrar
         $container->set(SystemHealthService::class, static fn (AppContainer $c): SystemHealthService => new SystemHealthService(
             $c->get(SystemHealthRepository::class)
         ));
-        $container->set(SystemInfoService::class, static fn (AppContainer $c): SystemInfoService => new SystemInfoService(
-            $c->get(SystemHealthService::class),
-            $c->get(SystemHealthRepository::class),
-            $c->has(ModuleRegistry::class) ? $c->get(ModuleRegistry::class) : null
-        ));
         $container->set(SearchDataService::class, static fn (AppContainer $c): SearchDataService => new SearchDataService(
             $c->get(PermissionService::class),
             $c->get(UserTenantRepository::class),