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/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "trek-client",
-  "version": "2.6.2",
+  "version": "2.7.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "trek-client",
-      "version": "2.6.2",
+      "version": "2.7.0",
       "dependencies": {
         "@react-pdf/renderer": "^4.3.2",
         "axios": "^1.6.7",