Add doorbell-listener: ntfy → zigbee2mqtt Sideboard Lamp toggle

Polls ntfy.sh for ALERT_klubhaus_topic(_test) and publishes
{state: TOGGLE} to zigbee2mqtt/Sideboard Lamp/set on each new
message event. Dual-topic subscription so switching from test to
production requires no code change; sender still uses test topic.

- infra/doorbell-listener/: uv-based Docker service (arm64)
- compose: depends_on mosquitto, persists last_id per topic
- justfile: doorbell-publish, doorbell-logs, doorbell-rebuild,
  restart-all now includes doorbell-listener

infra/compose.yaml

@@ -53,3 +53,23 @@ services:
       TZ: America/Los_Angeles
       DASHBOARD_BASE_HREF: /dashboard/
     command: ["sh", "/data/start.sh"]
+
+  # Listens to ntfy.sh for doorbell events and toggles a smart plug on each alert.
+  # Topic: ALERT_klubhaus_topic_test (matches ESP32 firmware DEBUG_MODE suffix)
+  # Action: TOGGLE on zigbee2mqtt/Sideboard Lamp/set
+  doorbell-listener:
+    build: ./doorbell-listener
+    container_name: doorbell-listener
+    restart: unless-stopped
+    depends_on:
+      - mosquitto
+    volumes:
+      - ./doorbell-listener/state:/data/doorbell-listener
+    environment:
+      MQTT_HOST: mosquitto
+      MQTT_PORT: "1883"
+      PLUG_TOPIC: "zigbee2mqtt/Sideboard Lamp/set"
+      POLL_INTERVAL: "30"
+      TZ: America/Los_Angeles
+
+