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/registerContainer.php

@@ -12,7 +12,12 @@ use MintyPHP\App\Container\Registrars\SettingsRegistrar;
 use MintyPHP\App\Container\Registrars\UserRegistrar;
 use MintyPHP\App\Module\ModuleEventDispatcher;
 use MintyPHP\App\Module\ModuleRegistry;
-use MintyPHP\Service\Audit\SystemAuditService;
+use MintyPHP\Service\Audit\AuditRecorderInterface;
+use MintyPHP\Service\Audit\ImportAuditInterface;
+use MintyPHP\Service\Audit\NullAuditRecorder;
+use MintyPHP\Service\Audit\NullImportAudit;
+use MintyPHP\Service\Audit\NullUserLifecycleAudit;
+use MintyPHP\Service\Audit\UserLifecycleAuditInterface;
 
 $container = new AppContainer();
 
@@ -48,7 +53,7 @@ $container->set(ModuleRegistry::class, static fn (): ModuleRegistry => $moduleRe
 $container->set(ModuleEventDispatcher::class, static fn () => new ModuleEventDispatcher(
     $moduleRegistry->getEventListeners(),
     $container,
-    $container->has(SystemAuditService::class) ? $container->get(SystemAuditService::class) : null
+    $container->has(AuditRecorderInterface::class) ? $container->get(AuditRecorderInterface::class) : null
 ));
 
 // Disallow overriding existing core bindings from module registrars.
@@ -67,4 +72,15 @@ foreach ($moduleRegistry->getContainerRegistrars() as $registrarClass) {
     $registrarInstance->register($container);
 }
 
+// ── Audit interface fallbacks (null implementations when audit module is disabled) ──
+if (!$container->has(AuditRecorderInterface::class)) {
+    $container->set(AuditRecorderInterface::class, static fn (): AuditRecorderInterface => new NullAuditRecorder());
+}
+if (!$container->has(UserLifecycleAuditInterface::class)) {
+    $container->set(UserLifecycleAuditInterface::class, static fn (): UserLifecycleAuditInterface => new NullUserLifecycleAudit());
+}
+if (!$container->has(ImportAuditInterface::class)) {
+    $container->set(ImportAuditInterface::class, static fn (): ImportAuditInterface => new NullImportAudit());
+}
+
 return $container;