feat: add cameleer3-server-ui container to Docker Compose

The cameleer3-server deploys backend and UI as separate containers.
Add the cameleer3-server-ui image (nginx SPA + API reverse proxy)
to the Compose stack, exposed on port 8082 in dev. Update sidebar
"View Dashboard" link to point to the UI container.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -159,6 +159,17 @@ services:
     networks:
       - cameleer
 
+  cameleer3-server-ui:
+    image: ${CAMELEER3_SERVER_UI_IMAGE:-gitea.siegeln.net/cameleer/cameleer3-server-ui}:${VERSION:-latest}
+    restart: unless-stopped
+    depends_on:
+      cameleer3-server:
+        condition: service_healthy
+    environment:
+      CAMELEER_API_URL: http://cameleer3-server:8081
+    networks:
+      - cameleer
+
   clickhouse:
     image: clickhouse/clickhouse-server:latest
     restart: unless-stopped