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

roles/deploy-user/tasks/main.yml

@@ -0,0 +1,41 @@
+---
+- name: Vytvor skupiny pro deploy uzivatele
+  ansible.builtin.group:
+    name: "{{ item }}"
+    state: present
+  loop: "{{ deploy_groups }}"
+
+- name: Vytvor deploy uzivatele (UID {{ deploy_uid }})
+  ansible.builtin.user:
+    name: "{{ deploy_user }}"
+    uid: "{{ deploy_uid }}"
+    group: "{{ deploy_groups[0] }}"
+    groups: "{{ deploy_groups | join(',') }}"
+    shell: "{{ deploy_shell }}"
+    create_home: true
+    home: "{{ deploy_home }}"
+    password: "!"
+    update_password: always
+    append: true
+
+- name: Uzamkni heslo deploy uzivatele
+  ansible.builtin.command: passwd -l {{ deploy_user }}
+  changed_when: false
+
+- name: Vytvor .ssh adresar pro deploy uzivatele
+  ansible.builtin.file:
+    path: "{{ deploy_home }}/.ssh"
+    state: directory
+    owner: "{{ deploy_user }}"
+    group: "{{ deploy_user }}"
+    mode: "0700"
+
+- name: Vytvor authorized_keys soubor
+  ansible.builtin.file:
+    path: "{{ deploy_home }}/.ssh/authorized_keys"
+    state: touch
+    owner: "{{ deploy_user }}"
+    group: "{{ deploy_user }}"
+    mode: "0600"
+    modification_time: preserve
+    access_time: preserve