List instance user endpoint

[windmill-internal-app]

/ai create a new end point to list instance users (only for non cloud). Use it to replace the 'Add new user' email field of the workspace settings with a Select (when available). Request made by @Guilhem-lm

[claude]

Claude finished @windmill-internal-app[bot]'s task in 11m 1s —— View job • claude/issue-7902-20260211-1113 • [Create PR ➔](https://github.com/windmill-labs/windmill/compare/main...claude/issue-7902-20260211-1113?quick_pull=1&title=Issue%20%237902%3A%20Changes%20from%20Claude&body=This%20PR%20addresses%20issue%20%237902%0A%0AGenerated%20with%20%5BClaude%20Code%5D(https%3A%2F%2Fclaude.ai%2Fcode)

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Completed: List instance users endpoint

• Gather context: explore backend and frontend code
• Create backend endpoint GET /users/list_instance_emails (non-cloud only)
• Update OpenAPI spec with the new endpoint
• Regenerate frontend API client
• Update AddUser.svelte to use Select with instance emails when available
• Run backend validation (cargo check) — passed
• Run frontend validation (npm run check) — passed (0 errors)
• Commit and push changes
• Open draft PR

Summary

Backend: Added a new GET /users/list_instance_emails endpoint in windmill-api-users that returns all instance user emails from the password table (sorted alphabetically). The endpoint returns a 400 error on cloud-hosted instances.

Frontend: Updated AddUser.svelte to fetch instance emails on mount (non-cloud only). When available, the email text input is replaced with a Select component that supports:

• Filtering/searching existing instance users by typing
• Selecting an email from the dropdown
• Typing a custom email via the "Use custom email:" create option
• Graceful fallback to the plain <input> on cloud instances or if the endpoint fails

Draft PR: #7903
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