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/i18n/default_en.json

@@ -0,0 +1,71 @@
+{
+  "Telemetry helps detect recurring UI issues and failed requests in production.": "Telemetry helps detect recurring UI issues and failed requests in production.",
+  "perm.user_lifecycle_audit.view": "View user lifecycle logs",
+  "perm.users.lifecycle_restore": "Restore users from lifecycle audit",
+  "User lifecycle": "User lifecycle",
+  "Audit": "Audit",
+  "API audit": "API logs",
+  "API audit logs": "API logs",
+  "Purge API audit logs": "Purge API logs",
+  "Purge entries older than 90 days?": "Purge entries older than 90 days?",
+  "%d API audit entries purged": "%d API log entries purged",
+  "API audit entry not found": "API log entry not found",
+  "View API audit entry": "View API log entry",
+  "Import audit logs": "Import audit logs",
+  "Can view import audit logs": "Can view import audit logs",
+  "Purge import logs": "Purge import logs",
+  "%d import audit entries purged": "%d import audit entries purged",
+  "Import audit entry not found": "Import audit entry not found",
+  "View import audit entry": "View import audit entry",
+  "User lifecycle policy": "User lifecycle policy",
+  "User lifecycle defines when inactive users are deactivated or deleted.": "User lifecycle defines when inactive users are deactivated or deleted.",
+  "System audit controls whether security events are logged and how long they are kept.": "System audit controls whether security events are logged and how long they are kept.",
+  "Privileged admins are excluded from automatic lifecycle actions": "Privileged admins are excluded from automatic lifecycle actions",
+  "Run user lifecycle now?": "Run user lifecycle now?",
+  "Run user lifecycle now": "Run user lifecycle now",
+  "User lifecycle already running": "User lifecycle already running",
+  "User lifecycle failed": "User lifecycle failed",
+  "User lifecycle completed: %d deactivated, %d deleted": "User lifecycle completed: %d deactivated, %d deleted",
+  "Purge scheduler logs": "Purge scheduler logs",
+  "Purge run logs older than 90 days?": "Purge run logs older than 90 days?",
+  "%d scheduler run logs purged": "%d scheduler run logs purged",
+  "User lifecycle logs": "User lifecycle logs",
+  "View user lifecycle audit entry": "View user lifecycle audit entry",
+  "Lifecycle audit entry not found": "Lifecycle audit entry not found",
+  "Purge user lifecycle logs": "Purge user lifecycle logs",
+  "Purge entries older than 365 days?": "Purge entries older than 365 days?",
+  "%d user lifecycle audit entries purged": "%d user lifecycle audit entries purged",
+  "Lifecycle event": "Lifecycle event",
+  "Restore this user from lifecycle snapshot?": "Restore this user from lifecycle snapshot?",
+  "Lifecycle event was already restored": "Lifecycle event was already restored",
+  "Lifecycle snapshot unavailable": "Lifecycle snapshot unavailable",
+  "System audit": "System audit",
+  "System audit logs": "System audit logs",
+  "View system audit entry": "View system audit entry",
+  "System audit entry not found": "System audit entry not found",
+  "Enable system audit log": "Enable system audit log",
+  "Purge system audit logs": "Purge system audit logs",
+  "Purge expired system audit entries?": "Purge expired system audit entries?",
+  "%d system audit entries purged": "%d system audit entries purged",
+  "Frontend telemetry": "Frontend telemetry",
+  "Enable frontend telemetry": "Enable frontend telemetry",
+  "Allowed telemetry events": "Allowed telemetry events",
+  "Telemetry": "Telemetry",
+  "Telemetry helps us find UI problems faster.": "Telemetry helps us find UI problems faster.",
+  "The percentage of users who will have telemetry enabled.": "The percentage of users who will have telemetry enabled.",
+  "Advanced telemetry options": "Advanced telemetry options",
+  "setting.system_audit_enabled": "Enable/disable system audit logging",
+  "setting.system_audit_retention_days": "Retention in days for system audit entries",
+  "setting.frontend_telemetry_enabled": "Enable/disable secure frontend UX and error telemetry",
+  "setting.frontend_telemetry_sample_rate": "Sampling rate between 0 and 1 for accepted frontend telemetry events",
+  "setting.frontend_telemetry_allowed_events": "Allowed frontend telemetry event groups (warn_once, ajax_error)",
+  "System audit events (24h)": "System audit events (24h)",
+  "System audit risks (24h)": "System audit risks (24h)",
+  "Top system audit event types (24h)": "Top system audit event types (24h)",
+  "Recent system audit risks (24h)": "Recent system audit risks (24h)",
+  "User lifecycle audit": "User lifecycle audit",
+  "Lifecycle runs (7d)": "Lifecycle runs (7d)",
+  "Lifecycle risks (7d)": "Lifecycle risks (7d)",
+  "Top lifecycle reason codes (7d)": "Top lifecycle reason codes (7d)",
+  "Recent lifecycle risks (7d)": "Recent lifecycle risks (7d)"
+}