Fix external domain dropdown defaulting to alphabetically first instead of site-default domain

[Copilot]

When creating/editing a container with an HTTP service, the domain dropdown was sorted alphabetically by name, causing a non-default domain to be auto-selected instead of the site's default domain.

Changes

• routers/containers.js: Replaced ORDER BY name ASC with a partitioned sort — site-default domains (where siteId matches the current site) come first ordered by id, followed by all others ordered by id.
• Added sortExternalDomains(domains, siteId) helper to encapsulate the single-pass partition, used by both the new and edit container routes.

function sortExternalDomains(domains, siteId) {
  const defaults = [], others = [];
  for (const domain of domains) {
    (domain.siteId === siteId ? defaults : others).push(domain);
  }
  return [...defaults, ...others];
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Bug]: Non-default external domain being listed first for HTTP services</issue_title>
<issue_description>### Current URL

/sites/1/containers/new

Username

rgingras

Version

a2bd601

Steps to reproduce

1. Create or edit a container
2. Add an HTTP service
3. Observe non-default domain populated in the field

Expected behavior

The first default domain for the site should be populated.

Actual behavior

The alphabetically first domain is used.

Additional context

No response</issue_description>

<agent_instructions>When sorting externalDomains in the drop down, all domains that are default for the site should be sorted first, in order by database id, then all non-default domains, still in order by database id.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Bug]: Non-default external domain being listed first for HTTP services #208

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[runleveldev]

LGTM