Add service registry, shared roles and unified reverse proxy

Collect the facts about all 14 services -- VMID, node, address, ports,
domain, pinned images, resources, backup and monitoring participation --
into group_vars/all/services.yml. Values are taken from the existing
playbooks; gaps are marked null rather than invented.

Replace reverse-proxy-{gitea,vaultwarden,grimmory}.yml with a single
playbook iterating over registry entries that declare a domain. It keeps
every check the three had, preserves grimmory's richer Caddy block
byte-for-byte, and restarts Caddy once when any site changed instead of
up to three times. Verified with --check --diff against ru-vps: ok=6
changed=0, so it reproduces the current Caddyfile exactly.

Add two roles factoring out the skeleton duplicated across the pve-*
playbooks: lxc_docker_host (packages, /dev/fuse assertion, fuse-overlayfs
storage driver, UFW baseline) and compose_service (compose file, systemd
unit, config validation, health check). They are not wired into any
playbook yet -- migrating a live service is a separate, per-service step;
compose_service/README.md shows the Gitea example and spells out what
actually changes on the host.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GTocXkGUUazHdKKd3r9k71

ansible/roles/lxc_docker_host/tasks/main.yml

@@ -0,0 +1,113 @@
+---
+- name: Install Docker runtime packages
+  ansible.builtin.apt:
+    name: "{{ lxc_docker_host_all_packages }}"
+    state: present
+    update_cache: "{{ lxc_docker_host_update_cache }}"
+  vars:
+    lxc_docker_host_all_packages: >-
+      {{ (lxc_docker_host_packages
+          + lxc_docker_host_extra_packages
+          + (['docker-compose'] if lxc_docker_host_install_compose_package else [])
+          + (['prometheus-node-exporter'] if lxc_docker_host_install_node_exporter else [])
+          + (['ufw'] if (lxc_docker_host_manage_ufw and lxc_docker_host_install_ufw) else []))
+         | unique | sort }}
+
+- name: Check the FUSE device
+  ansible.builtin.stat:
+    path: "{{ lxc_docker_host_fuse_device }}"
+  register: lxc_docker_host_fuse
+  when: lxc_docker_host_require_fuse
+
+- name: Require the FUSE device
+  ansible.builtin.assert:
+    that:
+      - lxc_docker_host_fuse.stat.exists
+      - lxc_docker_host_fuse.stat.ischr
+    fail_msg: >-
+      {{ lxc_docker_host_fuse_device }} отсутствует или не является символьным
+      устройством. Добавьте в /etc/pve/lxc/<vmid>.conf на узле PVE:
+      "lxc.cgroup2.devices.allow: c 10:229 rwm" и
+      "lxc.mount.entry: /dev/fuse dev/fuse none bind,create=file",
+      затем перезапустите контейнер.
+  when: lxc_docker_host_require_fuse
+
+- name: Ensure the Docker config directory exists
+  ansible.builtin.file:
+    path: "{{ lxc_docker_host_daemon_config_path | dirname }}"
+    state: directory
+    owner: root
+    group: root
+    mode: "0755"
+
+- name: Configure the Docker storage driver for the unprivileged LXC
+  ansible.builtin.copy:
+    dest: "{{ lxc_docker_host_daemon_config_path }}"
+    owner: root
+    group: root
+    mode: "0644"
+    content: "{{ lxc_docker_host_daemon_config | to_nice_json(indent=2) }}\n"
+  register: lxc_docker_host_daemon_config_result
+
+- name: Ensure the Docker service is enabled and running
+  ansible.builtin.systemd:
+    name: docker
+    enabled: true
+    state: "{{ 'restarted' if lxc_docker_host_daemon_config_result.changed else 'started' }}"
+
+# --- UFW -------------------------------------------------------------------
+# Порядок важен: сначала разрешающие правила, только потом включение политики
+# deny incoming — иначе SSH обрывается прямо во время прогона.
+
+- name: Allow SSH from the trusted networks
+  community.general.ufw:
+    rule: allow
+    port: "{{ lxc_docker_host_ssh_port | string }}"
+    proto: tcp
+    src: "{{ item }}"
+  loop: "{{ lxc_docker_host_ssh_sources }}"
+  when: lxc_docker_host_manage_ufw
+
+- name: Allow the declared service ports
+  community.general.ufw:
+    rule: allow
+    port: "{{ item.0.port | string }}"
+    proto: "{{ item.0.proto | default('tcp') }}"
+    src: "{{ item.1 }}"
+    comment: "{{ item.0.comment | default(omit) }}"
+  loop: "{{ lxc_docker_host_ufw_service_rules | subelements('sources') }}"
+  loop_control:
+    label: "{{ item.0.port }}/{{ item.0.proto | default('tcp') }} from {{ item.1 }}"
+  when: lxc_docker_host_manage_ufw
+
+- name: Allow Node Exporter from the monitoring host
+  community.general.ufw:
+    rule: allow
+    port: "{{ lxc_docker_host_node_exporter_port | string }}"
+    proto: tcp
+    src: "{{ lxc_docker_host_monitoring_host }}"
+  when:
+    - lxc_docker_host_manage_ufw
+    - lxc_docker_host_allow_node_exporter
+
+- name: Enable the restrictive firewall
+  community.general.ufw:
+    state: enabled
+    policy: "{{ lxc_docker_host_ufw_policy }}"
+    direction: incoming
+  when:
+    - lxc_docker_host_manage_ufw
+    - lxc_docker_host_ufw_enable
+
+# --- Verification ----------------------------------------------------------
+- name: Verify the effective Docker storage driver
+  ansible.builtin.command:
+    argv:
+      - docker
+      - info
+      - --format
+      - "{% raw %}{{.Driver}}{% endraw %}"
+  register: lxc_docker_host_driver
+  changed_when: false
+  failed_when: lxc_docker_host_driver.stdout != lxc_docker_host_storage_driver
+  when: lxc_docker_host_verify_storage_driver