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>

modules/audit/lib/Module/Audit/Service/AuditMetadataEnricher.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace MintyPHP\Module\Audit\Service;
+
+use MintyPHP\Repository\User\UserReadRepositoryInterface;
+
+class AuditMetadataEnricher
+{
+    public function __construct(
+        private readonly UserReadRepositoryInterface $userReadRepository
+    ) {
+    }
+
+    /**
+     * Resolve audit user IDs on an entity into display labels and UUIDs.
+     *
+     * For each field name in $fields the method reads `$entity[$field]` as a
+     * user ID, looks up the user record, and sets `{$field}_label` (full name
+     * with email fallback) and `{$field}_uuid` on the entity.
+     *
+     * @param array<string,mixed> $entity The entity array (modified in place).
+     * @param list<string>        $fields Audit field names to resolve (e.g. 'created_by', 'modified_by').
+     */
+    public function enrich(array &$entity, array $fields = ['created_by', 'modified_by']): void
+    {
+        foreach ($fields as $field) {
+            $userId = (int) ($entity[$field] ?? 0);
+            if ($userId <= 0) {
+                continue;
+            }
+
+            $user = $this->userReadRepository->find($userId);
+            if (!$user) {
+                continue;
+            }
+
+            $name = trim(($user['first_name'] ?? '') . ' ' . ($user['last_name'] ?? ''));
+            $entity[$field . '_label'] = $name !== '' ? $name : ($user['email'] ?? '');
+            $entity[$field . '_uuid'] = $user['uuid'] ?? null;
+        }
+    }
+}