feat: add CAMELEER_SERVER_URL config property

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

cameleer3-server-app/src/main/resources/application.yml

@@ -51,6 +51,7 @@ cameleer:
     container-cpu-shares: ${CAMELEER_CONTAINER_CPU_SHARES:512}
     routing-mode: ${CAMELEER_ROUTING_MODE:path}
     routing-domain: ${CAMELEER_ROUTING_DOMAIN:localhost}
+    server-url: ${CAMELEER_SERVER_URL:}
   body-size-limit: ${CAMELEER_BODY_SIZE_LIMIT:16384}
   indexer:
     debounce-ms: ${CAMELEER_INDEXER_DEBOUNCE_MS:2000}