fix(ha-diag-agent): remove host port mapping for 8087

Port 8087 conflicted with zigbee2mqtt on piha (8087:8080 mapping active
for 7+ days), preventing ha-diag-agent from starting.

Grep across the full repo confirms no external consumer (no nginx/npm
proxy, no Prometheus scrape, no control-plane reference) uses this port.
The Docker healthcheck runs inside the container network namespace and
does not require a host-side mapping. Internal FastAPI binding on 8087
is unchanged.

Removed: ports section from docker-compose.yml and service.yaml.

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

services/ha-diag-agent/docker-compose.yml

@@ -7,9 +7,6 @@ services:
     env_file:
       - /opt/homelab/config/ha-diag-agent/.env
 
-    ports:
-      - "8087:8087"
-
     volumes:
       # Events dir: host path includes node name; inside container always /events
       - /opt/homelab/events/${NODE_NAME:-ha-diag}:/events

services/ha-diag-agent/service.yaml

@@ -8,9 +8,6 @@ service:
   dependencies:
     - homeassistant
 
-  ports:
-    - 8087
-
   healthcheck:
     type: http
     path: /health