feat: full WSL2 audio support and Windows audio stability fix

pkg/audio/capture.go

@@ -1,3 +1,5 @@
+//go:build windows
+
 package audio
 
 import (
@@ -11,8 +13,6 @@ import (
 	"github.com/moutend/go-wca/pkg/wca"
 )
 
-const captureFrameSamples = 960 // 20ms at 48kHz
-
 // Capturer handles WASAPI audio capture from microphone
 type Capturer struct {
 	client        *wca.IAudioClient