The /models endpoint restricted results to providers configured in
Fusion's auth.json/models.json stores, but custom providers live in
global settings and register under customProviderRegistryKey(). Their
keys were never added to the allowlist, so their models were filtered
out before reaching the dropdowns. Add the custom provider registry
keys to the configured-providers set.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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