Preserves explicit `supportsUsageInStreaming` overrides from built-in provider
catalogs and user config instead of unconditionally forcing `false` on non-native
openai-completions endpoints.
Adds `applyNativeStreamingUsageCompat()` to set `supportsUsageInStreaming: true`
on ModelStudio (DashScope) and Moonshot models at config build time so their
native streaming usage works out of the box.
Closes#46142
Co-authored-by: pezy <peizhe.chen@vbot.cn>
42837a04bf