feat(local-secrets): introduce unified local secrets management and documentation

- Add example secret files for `app_key`, `db_user_password`, and `redis_password`.
- Introduce `local.vault.yml.example` for Ansible Vault encryption of local secrets.
- Create migration and setup scripts for transitioning from `.env.local` to secrets files.
- Update `docker-compose.local.yml` to adopt Docker Secrets and `_FILE` pattern for local configurations.
- Add deployment playbooks and enhanced logging configurations for local development.

docker/php/Dockerfile

@@ -75,6 +75,7 @@ COPY docker/php/php.${ENV}.ini /usr/local/etc/php/php.ini
 
 # Kopiere PHP-FPM Pool-Konfiguration
 COPY docker/php/zz-docker.conf /usr/local/etc/php-fpm.d/zz-docker.conf
+COPY docker/php/zzzz-override.conf /usr/local/etc/php-fpm.d/zzzz-override.conf
 
 # Xdebug-Konfiguration nur wenn dev
 RUN if [ "$ENV" = "dev" ] && [ -f docker/php/xdebug.ini ]; then \