Replace duplicated inline provider resolution in routes.py and streaming.py
with a shared resolve_model_provider() helper in config.py.
Improvements over original:
- If model ID has a prefix matching any known direct-API provider
(not just the config provider), strip it and route correctly.
This handles edge cases like localStorage restoring a model from
a different provider group.
- Single source of truth for the resolution logic.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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