* Introduces an Ansible role for installing and registering `act_runner` for Gitea Actions.
* Automates PostgreSQL and MongoDB deployment on Docker Swarm in the test environment, leveraging Docker named volumes for data persistence.
* Translates core documentation, including `README.md` and `setup/04-test-db-docker-kurulum.md`, to Turkish.
* Adds comprehensive documentation for firewall architecture (`facts/firewall.md`) and Docker Swarm node recovery (`facts/swarm-node-recovery.md`).
* Enhances security hardening by ensuring `fail2ban` is enabled and streamlining admin SSH key management via Ansible.
* Updates Ansible vault structure to support new secret variables and adds `.vault_pass` to `.gitignore`.
- Add `hetzner-sizing-report.md` defining data-driven server type recommendations for test and prod environments.
- Update Terraform configurations to align with the recommended `CPX` server types and refine firewall rules for Docker Swarm and database interactions.
- Introduce comprehensive documentation and stack files for:
- Single-node PostgreSQL/MongoDB deployment on a test DB worker node.
- High-availability 3-node MongoDB replica set and Patroni+etcd PostgreSQL cluster for production.
- Enhance Ansible bootstrap roles with SELinux disabling, fail2ban configuration, and StorageBox SSH key management for CI/CD.
- Reorganize and rename setup documentation files for improved structure and clarity.
