feat: admin audit log — merged PR #118

Audit logging for admin actions, backups, auth events.
New AuditLogPanel in Admin tab with pagination.
Dockerfile security: run as non-root user.
i18n keys for all 9 languages.

Thanks @fgbona for the implementation!

client/src/pages/AdminPage.tsx

@@ -13,6 +13,7 @@ import BackupPanel from '../components/Admin/BackupPanel'
 import GitHubPanel from '../components/Admin/GitHubPanel'
 import AddonManager from '../components/Admin/AddonManager'
 import PackingTemplateManager from '../components/Admin/PackingTemplateManager'
+import AuditLogPanel from '../components/Admin/AuditLogPanel'
 import { Users, Map, Briefcase, Shield, Trash2, Edit2, Camera, FileText, Eye, EyeOff, Save, CheckCircle, XCircle, Loader2, UserPlus, ArrowUpCircle, ExternalLink, Download, AlertTriangle, RefreshCw, GitBranch, Sun, Link2, Copy, Plus } from 'lucide-react'
 import CustomSelect from '../components/shared/CustomSelect'
 
@@ -61,6 +62,7 @@ export default function AdminPage(): React.ReactElement {
     { id: 'addons', label: t('admin.tabs.addons') },
     { id: 'settings', label: t('admin.tabs.settings') },
     { id: 'backup', label: t('admin.tabs.backup') },
+    { id: 'audit', label: t('admin.tabs.audit') },
     { id: 'github', label: t('admin.tabs.github') },
   ]
 
@@ -978,6 +980,8 @@ export default function AdminPage(): React.ReactElement {
 
           {activeTab === 'backup' && <BackupPanel />}
 
+          {activeTab === 'audit' && <AuditLogPanel />}
+
           {activeTab === 'github' && <GitHubPanel />}
         </div>
       </div>