Add Cantonese language model support

Ariver

2026-07-02 0ffbf1935c9d091cce22a5583275ac0902f7a693

 privatevoice.src/internal/model/build_capabilities_windows.go

@@ -3,7 +3,8 @@
package model

func modelUnsupportedReasonInCurrentBuild(modelID string) string {
   if modelID == DefaultModelID {
   profile, err := GetModelProfile(modelID)
   if err == nil && profile.BackendKind == BackendSenseVoice {
      return ""
   }
   return UnsupportedReasonWindowsPreview