Remove ModelThinkingCapable interface and ChatRequest.ModelSupportsThinking
hint field — DashScope handles per-model checks internally via its own
whitelist. Fix double applyThinkingGuard on ChatStream→Chat tool fallback
by calling OpenAIProvider.Chat directly.
* feat(providers/dashscope): guard enable_thinking injection by per-model capability check
Introduces ModelThinkingCapable interface and ModelSupportsThinking field
on ChatRequest so DashScope can skip thinking-param injection for models
that do not support it (e.g. qwen3-plus, qwen3-turbo), preventing
\"model not supported\" API errors.
- types.go: add ModelThinkingCapable interface + ModelSupportsThinking *bool on ChatRequest
- dashscope.go: add dashscopeThinkingModels whitelist + ModelSupportsThinking(); honour pre-computed hint
- loop.go: detect ModelThinkingCapable and set hint on ChatRequest before LLM call
- provider_models.go: add qwen3.5-plus / qwen3.5-turbo to DashScope model list
- dashscope_test.go: full test suite for whitelist, injection, hint override, budget mapping
* Fix review code.
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Co-authored-by: Nguyen Gia Hoang Vinh <vinhngh@runsystem.net>
