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/ssh-keys/defaults/main.yml

@@ -0,0 +1,14 @@
+---
+# Proměnné pro ssh-keys roli
+deploy_user: deploy
+deploy_home: "/home/{{ deploy_user }}"
+ssh_key_path: "{{ deploy_home }}/.ssh/authorized_keys"
+ssh_key_owner: "{{ deploy_user }}"
+ssh_key_group: "{{ deploy_user }}"
+ssh_key_mode: "0600"
+
+# Verejne klice pro deploy uzivatele (nastav v inventory.yml)
+# deploy_ssh_public_keys:
+#   - "ssh-ed25519 AAAAC3Nz... hermes@mac"
+#   - "ssh-rsa AAAAB3... backup@server"
+deploy_ssh_public_keys: []