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/firewall/defaults/main.yml

@@ -0,0 +1,8 @@
+---
+# Proměnné pro firewall roli
+ssh_port: 22
+# Dalsi porty co chces povolit (pro servery)
+allowed_ports:
+  - { port: 80, proto: tcp, comment: "HTTP" }
+  - { port: 443, proto: tcp, comment: "HTTPS" }
+  - { port: "{{ ssh_port }}", proto: tcp, comment: "SSH" }