Implement Round 4 Parakeet model selection

Ariver

2026-06-03 62f9a3b1e84455c32971272c03163ca543e2f68f

 privatevoice.src/internal/engine/engine.go

@@ -90,7 +90,7 @@

func isSupportedBackend(backend string) bool {
   switch backend {
   case model.BackendSenseVoice, model.BackendMoonshine:
   case model.BackendSenseVoice, model.BackendMoonshine, model.BackendNemoTransducer:
      return true
   default:
      return false