SilverDESK rate-limits /api/auth/check-username after ~2 requests with a
5-minute cooldown. The old 500ms debounce per keystroke quickly exhausted
this limit, breaking the form. Now checks only on field blur, validates
format client-side while typing, and caches results to skip redundant calls.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
CheckUsernameAsync returned false (taken) on any API failure, making every
username appear taken when SilverDESK was unreachable. Now returns nullable
bool so errors show a warning instead of blocking submission.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add developer application page with form submission that creates tickets
in SilverDESK. Includes provisioning service scaffolding for Mattermost,
Mailcow, and Gitea account creation. Fixes API key header casing
(X-API-Key) and ticket payload to match SilverDESK's CreateTicketDto
contract.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
