Use node 22 slim for frontend npm network compatibility

doc/operations-and-configuration.md

@@ -44,6 +44,8 @@ docker compose logs -f
 
 ## Frontend Build Network Resilience
 
+The frontend Dockerfile uses `node:22-slim` by default for improved npm network compatibility on IPv4-only Linux hosts.
+
 The frontend image build supports npm fetch tuning through environment-driven compose build args:
 
 - `NPM_REGISTRY` (default `https://registry.npmjs.org/`)

frontend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:22-alpine
+FROM node:22-slim
 
 ARG NPM_REGISTRY=https://registry.npmjs.org/
 ARG NPM_FETCH_RETRIES=5