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>

tests/Architecture/SecurityLoggingRedactionContractTest.php

@@ -10,7 +10,7 @@ final class SecurityLoggingRedactionContractTest extends TestCase
 
     public function testSystemAuditRedactionCoversCredentialsTokensAndEmailFields(): void
     {
-        $content = $this->readProjectFile('lib/Service/Audit/SystemAuditRedactionService.php');
+        $content = $this->readProjectFile('modules/audit/lib/Module/Audit/Service/SystemAuditRedactionService.php');
 
         foreach ([
             "'password'",
@@ -37,7 +37,7 @@ final class SecurityLoggingRedactionContractTest extends TestCase
 
     public function testApiAuditRedactionCoversCredentialsAndAuthorizationFields(): void
     {
-        $content = $this->readProjectFile('lib/Service/Audit/ApiAuditService.php');
+        $content = $this->readProjectFile('modules/audit/lib/Module/Audit/Service/ApiAuditService.php');
 
         foreach ([
             "'token'",