Two related bugs in get_available_models():
1. cfg_base_url undefined for string model configs (#117):
cfg_base_url was defined inside 'elif isinstance(model_cfg, dict)'
but referenced unconditionally at line 506. If model config was a
plain string, NameError crashed model detection. Fix: initialize
cfg_base_url='' before the conditional.
2. Configured default_model missing from dropdown (#116):
The OpenRouter branch substituted _FALLBACK_MODELS without checking
if the user's model.default was in the list. Models like
'openrouter/free' or custom local models were invisible. Fix: after
building all groups, check if default_model is present. If not,
inject it at the top of the matching provider group.
Closes#116, closes#117
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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