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e0087acfb4
fix: model fallback routing for all model types and default model selection Backend: When ENABLE_CUSTOM_MODEL_FALLBACK is active and a custom model's base model is unavailable, the fallback now swaps the model and form data to the configured default model directly. This ensures routing uses the fallback model's type (pipe, Ollama, or OpenAI) instead of the original model's type, which previously caused "Model not found" errors when the fallback was a different backend type. Frontend: Fixed default model selection in new chat initialization where the admin-configured default models were always overwritten by the first available model. The first-available fallback now only triggers when the configured defaults don't resolve to valid available models.