refactor(audit): extract audit domain into self-contained module

Move the entire audit subsystem (system audit, API audit, import audit,
user lifecycle audit, frontend telemetry) from core into modules/audit/.

Core decoupling via interface-based injection:
- AuditRecorderInterface replaces SystemAuditService in 10+ core services
- UserLifecycleAuditInterface / ImportAuditInterface for specialized flows
- NullAuditRecorder fallback when audit module is disabled
- ApiBootstrap/ApiResponse use null-safe callable resolvers

Module structure (modules/audit/):
- Manifest with routes, permissions, scheduler jobs, authorization policy
- 9 services, 8 repositories, 6 domain enums, 4 job handlers
- 33 page files, 4 JS files, 8 test files, migration scripts, i18n

Core cleanup:
- OperationsAuthorizationPolicy, UiCapabilityMap, PermissionService
  surgically cleaned of audit-specific constants
- Sidebar template cleared of hardcoded audit navigation
- AuditModuleIsolationContractTest ensures no future core→module coupling

All quality gates pass: 1346 tests (19,276 assertions), PHPStan level 5
clean, architecture contracts verified.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/App/Container/Registrars/SettingsRegistrar.php

@@ -7,7 +7,7 @@ use MintyPHP\App\Container\ContainerRegistrar;
 use MintyPHP\Repository\Auth\ApiTokenRepository;
 use MintyPHP\Repository\Auth\RememberTokenRepository;
 use MintyPHP\Service\Access\RoleService;
-use MintyPHP\Service\Audit\SystemAuditService;
+use MintyPHP\Service\Audit\AuditRecorderInterface;
 use MintyPHP\Service\Branding\BrandingFaviconService;
 use MintyPHP\Service\Branding\BrandingLogoService;
 use MintyPHP\Service\Branding\BrandingServicesFactory;
@@ -63,7 +63,7 @@ final class SettingsRegistrar implements ContainerRegistrar
             $c->get(DepartmentService::class),
             $c->get(RememberTokenRepository::class),
             $c->get(ApiTokenRepository::class),
-            $c->get(SystemAuditService::class)
+            $c->get(AuditRecorderInterface::class)
         ));
         $container->set(ThemeConfigGateway::class, static fn (AppContainer $c): ThemeConfigGateway => $c->get(SettingServicesFactory::class)->createThemeConfigGateway());
         // Branding services are registered here because they depend on settings gateways