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!

docker-compose.yml

@@ -1,7 +1,23 @@
 services:
+  init-permissions:
+    image: alpine:3.20
+    container_name: trek-init-permissions
+    user: "0:0"
+    command: >
+      sh -c "mkdir -p /app/data /app/uploads &&
+             chown -R 1000:1000 /app/data /app/uploads &&
+             chmod -R u+rwX /app/data /app/uploads"
+    volumes:
+      - ./data:/app/data
+      - ./uploads:/app/uploads
+    restart: "no"
+
   app:
     image: mauriceboe/trek:latest
     container_name: trek
+    depends_on:
+      init-permissions:
+        condition: service_completed_successfully
     ports:
       - "3000:3000"
     environment: