feat: AI task API, token-based context windows, SSH password auth, sudo bypass detection

Replace message-count context windows with token-budget based ones for both
studio and shell. Add /api/ai/task endpoint for background tool
check/install/update. Enhance sudo blocking to catch piped/chained elevation
commands. Add SSH password support via sshpass and connection editing UI.
Remove realTokens persistence in favor of consumption tracking. Bump to 0.4.1.

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

internal/version/version.go

@@ -7,7 +7,7 @@ import (
 
 const (
 	Name    = "muyue"
-	Version = "0.4.0"
+	Version = "0.4.1"
 	Author  = "La Légion de Muyue"
 )