Add X-ASR experimental backend

Ariver

2026-06-07 d435cd4b9754de4a567261b1a877add3af977d9a

 privatevoice.src/internal/model/profile.go

@@ -5,6 +5,7 @@
   MoonshineModelID  = "moonshine-en"
   ParakeetModelID   = "parakeet-en"
   Qwen3ASRModelID   = "qwen3-asr-0.6b"
   XASRZhEn960ModelID = "x-asr-zh-en-960ms"
   DefaultLanguageID = "zh-CN"
   EnglishLanguageID = "en"
)