Add /app/provision and /app/provision/status endpoints for browser-based
Login Flow v2 app password provisioning. Used by Astrolabe's "Enable
Semantic Search" to chain OAuth (bearer token) + Login Flow v2 (app
password) in a single user interaction.
The provision page initiates Login Flow v2, opens Nextcloud's login URL
in a popup, polls for completion via background task, and redirects back
to the caller's redirect_uri on success.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>