Add ha-automation.yaml

feat(ha): add notification debouncing for doorbell person detection

- Set mode: single to prevent concurrent automation runs
- Add 60-second delay cooldown between notifications
- Update camera name to lowercase 'front' to match Frigate config
- Use Frigate event snapshot API for accurate thumbnails

Prevents notification spam while maintaining fast person detection.
One notification per minute maximum per person approach.

ha-automation.yaml

@@ -0,0 +1,20 @@
+alias: Notify - Doorbell Person Detected
+description: ""
+mode: single
+triggers:
+  - topic: frigate/events
+    value_template: >
+      {{ value_json['type'] == 'new' and value_json['after']['label'] ==
+      'person' and value_json['after']['camera'] == 'front' }}
+    trigger: mqtt
+conditions: []
+actions:
+  - data:
+      message: 🚪 Someone is at the door
+      data:
+        image: >-
+          http://192.168.0.5:5341/api/events/{{trigger.payload_json['after']['id']}}/snapshot.jpg
+        url: homeassistant://navigate/dashboard-camera/0
+    action: notify.household_phones
+  - delay:
+      seconds: 30