Remove user/permission management for Dokploy deployment

- Dockerfile: remove appuser creation, run everything as root
- www.conf: switch php-fpm workers to www-data
- entrypoint.sh: remove all chown and git safe.directory workarounds
- docker-compose.yml: remove USER_ID/GROUP_ID build args
- .env.example: remove USER_ID/GROUP_ID variables

.env.example

@@ -33,6 +33,3 @@ MAIL_FROM_ADDRESS="noreply@termanager2.local"
 MAIL_FROM_NAME="${APP_NAME}"
 
 MAILPIT_UI_PORT=8025
-
-USER_ID=1000
-GROUP_ID=1000