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/pages/admin/frontend-telemetry/ingest().php

@@ -0,0 +1,107 @@
+<?php
+
+use MintyPHP\Http\RequestContext;
+use MintyPHP\Http\SessionStoreInterface;
+use MintyPHP\Router;
+use MintyPHP\Module\Audit\Service\FrontendTelemetryIngestService;
+use MintyPHP\Session;
+
+if ((requestInput()->method()) !== 'POST') {
+    http_response_code(405);
+    Router::json(['ok' => false, 'error' => 'method_not_allowed']);
+    return;
+}
+
+$sessionStore = app(SessionStoreInterface::class);
+$session = $sessionStore->all();
+$currentUserId = (int) ($session['user']['id'] ?? 0);
+if ($currentUserId <= 0) {
+    http_response_code(403);
+    Router::json(['ok' => false, 'error' => 'forbidden']);
+    return;
+}
+
+if (!Session::checkCsrfToken()) {
+    http_response_code(403);
+    Router::json(['ok' => false, 'error' => 'csrf']);
+    return;
+}
+
+$body = requestInput()->bodyAll();
+if (!is_array($body)) {
+    http_response_code(204);
+    return;
+}
+
+$allowedKeys = ['event_type', 'severity', 'message', 'fingerprint', 'meta', 'occurred_at'];
+$csrfKey = Session::$csrfSessionKey;
+foreach ($body as $key => $value) {
+    if (!is_string($key)) {
+        continue;
+    }
+
+    if ($key === $csrfKey) {
+        continue;
+    }
+
+    if (!in_array($key, $allowedKeys, true)) {
+        http_response_code(204);
+        return;
+    }
+}
+
+$payload = [];
+foreach ($allowedKeys as $key) {
+    if (!array_key_exists($key, $body)) {
+        continue;
+    }
+    $payload[$key] = $body[$key];
+}
+
+$eventType = $payload['event_type'] ?? null;
+$severity = $payload['severity'] ?? null;
+$message = $payload['message'] ?? null;
+$fingerprint = $payload['fingerprint'] ?? null;
+$meta = $payload['meta'] ?? null;
+$occurredAt = $payload['occurred_at'] ?? null;
+
+if (($eventType !== null && is_array($eventType))
+    || ($severity !== null && is_array($severity))
+    || ($message !== null && is_array($message))
+    || ($fingerprint !== null && is_array($fingerprint))
+    || ($occurredAt !== null && is_array($occurredAt))
+    || ($meta !== null && !is_array($meta) && !is_string($meta))
+) {
+    http_response_code(204);
+    return;
+}
+
+$eventTypeLength = strlen((string) $eventType);
+$severityLength = strlen((string) $severity);
+$messageLength = strlen((string) $message);
+$fingerprintLength = strlen((string) $fingerprint);
+$occurredAtLength = strlen((string) $occurredAt);
+$metaLength = is_string($meta) ? strlen($meta) : 0;
+
+if ($eventTypeLength > 64
+    || $severityLength > 16
+    || $messageLength > 1000
+    || $fingerprintLength > 256
+    || $occurredAtLength > 64
+    || $metaLength > 2048
+) {
+    http_response_code(204);
+    return;
+}
+
+$payloadSize = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+if (is_string($payloadSize) && strlen($payloadSize) > 4096) {
+    http_response_code(204);
+    return;
+}
+
+$result = app(FrontendTelemetryIngestService::class)->ingest($payload);
+if (!(bool) ($result['accepted'] ?? false) && (string) ($result['reason'] ?? '') === 'record_failed') {
+    error_log('[frontend-telemetry] ingest record_failed request_id=' . RequestContext::id());
+}
+http_response_code(204);