fix(cmd): export variables for test accessibility

Export rootCmd->RootCmd and appVersion->AppVersion to fix test compilation errors. Update all references across cmd package and tests.

cmd/add.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"fmt"
+
 	"github.com/Gu1llaum-3/sshm/internal/ui"
 
 	"github.com/spf13/cobra"
@@ -26,5 +27,5 @@ var addCmd = &cobra.Command{
 }
 
 func init() {
-	rootCmd.AddCommand(addCmd)
+	RootCmd.AddCommand(addCmd)
 }