feat: add exposed port routing and route URL to app API

Adds domain config to RuntimeConfig/application.yml, expands AppResponse
with exposedPort and computed routeUrl, adds updateRouting to AppService,
and adds PATCH /{appId}/routing endpoint to AppController.

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

src/main/resources/application.yml

@@ -45,5 +45,6 @@ cameleer:
     container-cpu-shares: ${CAMELEER_CONTAINER_CPU_SHARES:512}
     bootstrap-token: ${CAMELEER_AUTH_TOKEN:}
     cameleer3-server-endpoint: ${CAMELEER3_SERVER_ENDPOINT:http://cameleer3-server:8081}
+    domain: ${DOMAIN:localhost}
   clickhouse:
     url: ${CLICKHOUSE_URL:jdbc:clickhouse://clickhouse:8123/cameleer}