Yijia-Xiao 45c1744b86 fix(llm): apply DeepSeek capabilities to OpenRouter-namespaced models ...

- OpenRouter exposes DeepSeek as deepseek/<id>, which matched neither the exact
  IDs nor the patterns, so a thinking model like deepseek/deepseek-v4-flash fell
  through to _DEFAULT and had object-form tool_choice forced on it
- strip the official deepseek/ namespace before lookup so it reuses the native
  quirks; deepseek/deepseek-chat still keeps tool_choice, and third-party
  finetunes on other publishers stay on _DEFAULT #1199

2026-08-31 02:15:32 +00:00

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