feat: prepare-new-server playbook + role struktura

playbook prepare-new-server.yml:
- update systemu
- deploy user (UID 1000, heslo zamknuto)
- SSH klic pro deploy uzivatele
- adresarova struktura (/home/deploy/{docker,scripts,backups,logs,...})
- Docker Engine + Compose plugin (bez sudo)
- UFW firewall (22, 80, 443)
- fail2ban
- overeni docker bez sudo

Role (kazda v samostatnem adresari):
- common: update, base packages, timezone
- deploy-user: vytvoreni usera UID 1000
- ssh-keys: authorized_keys deployment
- firewall: UFW konfigurace
- docker: Docker Engine + Compose + daemon.json
- directories: /home/deploy/{docker/<sluzba>,backups,scripts,logs}

Pouziti:
  ansible-playbook -i inventory.yml playbooks/prepare-new-server.yml

roles/deploy-user/defaults/main.yml

@@ -0,0 +1,12 @@
+---
+# Proměnné pro deploy-user roli
+deploy_user: deploy
+deploy_uid: 1000
+deploy_home: "/home/{{ deploy_user }}"
+deploy_groups:
+  - docker
+  - sudo
+  - adm
+  - systemd-journal
+deploy_shell: /bin/bash
+deploy_password_locked: true  # heslo zamknuto, jen SSH klic