When a user has custom_providers configured in config.yaml, their custom
models should appear in the model picker even if active_provider is set
to a different provider (e.g. openrouter). Previously, the custom provider
was always discarded from detected_providers when active_provider != 'custom',
making custom models invisible.
Fix: only discard 'custom' if there are no custom_providers entries.
Co-authored-by: cloudyun888 <cloudyun888@users.noreply.github.com>
Co-authored-by: shruggr <shruggr@users.noreply.github.com>
7ea7331f26