feat(sunsonic): expose type serverVersion in subsonic responses

https://opensubsonic.netlify.app/docs/responses/subsonic-response/
https://github.com/opensubsonic/open-subsonic-api/discussions/3

version.go

@@ -3,13 +3,12 @@ package gonic
 
 import (
 	_ "embed"
-	"fmt"
 	"strings"
 )
 
 //go:embed version.txt
 var version string
-var Version = fmt.Sprintf("v%s", strings.TrimSpace(version))
+var Version = strings.TrimSpace(version)
 
 const Name = "gonic"
 const NameUpper = "GONIC"