Create slim PrivateVoice2 handoff package

Ariver

2026-07-02 abb469859662c285fac758c042812e0da943728f

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//go:build windows
 
package model
 
func modelUnsupportedReasonInCurrentBuild(modelID string) string {
    profile, err := GetModelProfile(modelID)
    if err == nil && profile.BackendKind == BackendSenseVoice {
        return ""
    }
    return UnsupportedReasonWindowsPreview
}