fix: ionos.ini format for modern certbot-dns-ionos (2.3.2)

[montoyaedu]

Problem (follow-up to #35)

With the certbot flags fixed (#35), easy proxy certbot-ionos ethiclab.it now reaches the IONOS plugin but aborts:

Missing properties in credentials configuration file /etc/letsencrypt/ionos.ini:
 * Property "dns_ionos_endpoint" not found
 * Property "dns_ionos_prefix" not found
 * Property "dns_ionos_secret" not found

The current certbot-dns-ionos plugin dropped dns_ionos_api_key / dns_ionos_api_secret.

Fix (commands/proxy.sh)

Write the supported keys:

dns_ionos_prefix   = <api-key>     # IONOS "Public Prefix"
dns_ionos_secret   = <api-secret>  # IONOS "Secret"
dns_ionos_endpoint = https://api.hosting.ionos.com

• The IONOS API key is <prefix>.<secret>, so the stored ionos/api-key is the public prefix and ionos/api-secret is the secret — stored credentials are unchanged, only the ini key names + the new endpoint line.
• Endpoint overridable via IONOS_API_ENDPOINT (default covers all accounts).
• Format verified against the plugin README (helgeerbe/certbot-dns-ionos).

Tests

New assertion that ionos.ini is written with prefix/secret/endpoint and no legacy api_key. Full suite 55/55.

Release

Patch 2.3.1 → 2.3.2 (package.json, CLAUDE.md, CHANGELOG, version tests).

Also recorded (knowledge base, not a code change here)

The easy proxy reload failure on the server (open() "/usr/local/share/easy/nginx.conf" failed) is caused by running npm install -g while the proxy container is up — it rewrites easyhome/, breaking the live container's bind mount. Fix is to recreate the container after a CLI upgrade (easy proxy destroy && easy proxy create, or restart). Documented as a gotcha.

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