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.dev.yml

@@ -24,6 +24,10 @@ services:
     ports:
       - "8081:8081"
 
+  cameleer3-server-ui:
+    ports:
+      - "8082:80"
+
   clickhouse:
     ports:
       - "8123:8123"