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

docker-compose.yml

@@ -2,9 +2,6 @@ services:
   app:
     build:
       context: ./docker/php
-      args:
-        USER_ID: ${USER_ID:-1000}
-        GROUP_ID: ${GROUP_ID:-1000}
     container_name: termanager2_app
     restart: unless-stopped
     working_dir: /var/www/html