Add Ansible playbooks, inventory, and scripts for initial setup
Includes: - `bootstrap-debian13.yml` for system setup and user configuration - `firewall-iptables.yml` for IPv4 firewall management - `run-playbook.sh` and `check.sh` scripts for playbook execution and validation - `inventory.ini` for host definitions - Template for iptables rules at `templates/iptables/rules.v4.j2` - `README.md` with usage instructions
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