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/Service/Audit/ImportAuditInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace MintyPHP\Service\Audit;
+
+/**
+ * Core-side contract for recording import audit events.
+ *
+ * Implemented by the audit module's ImportAuditService when active.
+ * Falls back to NullImportAudit (no-op) when the audit module is disabled.
+ */
+interface ImportAuditInterface
+{
+    /**
+     * @param array<int, string> $mappedTargets
+     */
+    public function startRun(
+        string $profileKey,
+        array $mappedTargets,
+        ?string $sourceFilename,
+        int $userId,
+        ?int $currentTenantId
+    ): ?int;
+
+    /**
+     * @param array<string, mixed> $result
+     */
+    public function finishRun(?int $runId, array $result, ?string $forcedStatus = null): void;
+}