fix(ansible): Screenshot-Dependencies und MQTT-Variablennamen korrigieren

scrot, imagemagick und x11-apps werden jetzt automatisch auf allen
signage_players installiert. Außerdem MQTT_USER/PASS in compose auf
MQTT_USERNAME/PASSWORD korrigiert (passt zu den Backend-Env-Var-Namen).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ansible/roles/signage_player/tasks/main.yml

@@ -17,6 +17,15 @@
     state: present
   become: true
 
+- name: Install screenshot tools for morz-agent
+  ansible.builtin.apt:
+    name:
+      - scrot
+      - imagemagick
+      - x11-apps
+    state: present
+  become: true
+
 - name: Ensure config directory exists
   ansible.builtin.file:
     path: "{{ signage_config_dir }}"

compose/server-stack.yml

@@ -32,7 +32,9 @@ services:
       MORZ_INFOBOARD_HTTP_ADDR: ":8080"
       MORZ_INFOBOARD_DATABASE_URL: "postgres://morz_infoboard:morz_infoboard@postgres:5432/morz_infoboard?sslmode=disable"
       MORZ_INFOBOARD_UPLOAD_DIR: "/uploads"
-      MORZ_INFOBOARD_MQTT_BROKER: "tcp://mosquitto:1883"
+      MORZ_INFOBOARD_MQTT_BROKER: "${MORZ_INFOBOARD_MQTT_BROKER}"
+      MORZ_INFOBOARD_MQTT_USERNAME: "${MORZ_INFOBOARD_MQTT_USERNAME}"
+      MORZ_INFOBOARD_MQTT_PASSWORD: "${MORZ_INFOBOARD_MQTT_PASSWORD}"
       MORZ_INFOBOARD_ADMIN_PASSWORD: "${MORZ_INFOBOARD_ADMIN_PASSWORD}"
       MORZ_INFOBOARD_DEV_MODE: "${MORZ_INFOBOARD_DEV_MODE:-false}"
       TZ: "Europe/Berlin"