fix(audit): harden module isolation and fix post-extraction drift

Fix 5 broken FQCN references (runtime errors) where core pages referenced
non-existent MintyPHP\Service\Audit\AuditMetadataEnricher and SystemAuditService.
Add AuditMetadataEnricherInterface with NullAuditMetadataEnricher fallback so
deactivating the audit module no longer crashes core edit pages.

Move audit search resources from core Search*Provider files into the module
via a new AuditSearchResourceProvider implementing the existing
SearchResourceProvider contract. Add module-specific purge permissions
(audit.api.purge, audit.imports.purge) replacing core ABILITY_ADMIN_SETTINGS_UPDATE.

Also fixes: session key prefix convention, hardcoded English string, $_SERVER
superglobal fallback, and manifest schema drift (i18n_path, group in ui_slots).

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

modules/audit/tests/Module/Audit/Service/FrontendTelemetryIngestServiceTest.php

@@ -210,12 +210,12 @@ class FrontendTelemetryIngestServiceTest extends TestCase
         $sessionStore->expects($this->once())->method('all')->willReturn(['user' => ['id' => 7]]);
         $sessionStore->expects($this->once())
             ->method('get')
-            ->with('frontend_telemetry_state', [])
+            ->with('module.audit.frontend_telemetry_state', [])
             ->willReturn([]);
         $sessionStore->expects($this->once())
             ->method('set')
             ->with(
-                'frontend_telemetry_state',
+                'module.audit.frontend_telemetry_state',
                 $this->callback(static function (mixed $value): bool {
                     if (!is_array($value)) {
                         return false;