ansible: add xray_client role + playbook + [xray] inventory group

- New role: xray_client (deploys Xray VLESS+Reality client container)
- New playbook: xray-client.yml
- New inventory group: [xray] (emby-sascha, emby-chris)
- pfannkuchen.sh: new command 'xray'
- Prepared for migration from FRP to Xray tunnel

roles/xray_client/tasks/main.yml

@@ -0,0 +1,28 @@
+---
+- name: Ensure xray config directory exists
+  file:
+    path: /app-config/xray
+    state: directory
+    mode: '0750'
+
+- name: Copy xray client config
+  copy:
+    src: "{{ xray_config_path }}"
+    dest: /app-config/xray/client.json
+    mode: '0640'
+  notify: restart xray-client
+
+- name: Pull xray image
+  community.docker.docker_image:
+    name: "{{ xray_image }}"
+    source: pull
+
+- name: Start xray-client container
+  community.docker.docker_container:
+    name: "{{ xray_container_name }}"
+    image: "{{ xray_image }}"
+    state: started
+    restart_policy: unless-stopped
+    network_mode: host
+    volumes:
+      - "/app-config/xray/client.json:/etc/xray/config.json:ro"