Fix instance data survival time issue

The data in the Temp directory has a short retention period, posing a risk of data loss. Therefore, it has been changed to the AppData directory.

WelsonJS.Toolkit/WelsonJS.Launcher/InstancesForm.cs

@@ -7,7 +7,7 @@ namespace WelsonJS.Launcher
 {
     public partial class InstancesForm : Form
     {
-        private readonly string instancesRoot = Path.GetTempPath();
+        private string instancesRoot;
         private string entryFileName;
         private string scriptName;
 
@@ -15,6 +15,7 @@ namespace WelsonJS.Launcher
         {
             InitializeComponent();
 
+            instancesRoot = Program.GetAppDataPath();
             entryFileName = "bootstrap.bat";
         }
 

WelsonJS.Toolkit/WelsonJS.Launcher/MainForm.cs

@@ -69,7 +69,7 @@ namespace WelsonJS.Launcher
         private void ExtractAndRun(string filePath)
         {
             instanceId = Guid.NewGuid().ToString();
-            workingDirectory = Path.Combine(Path.GetTempPath(), instanceId);
+            workingDirectory = Path.Combine(Program.GetAppDataPath(), instanceId);
             scriptName = textBox1.Text;
 
             Task.Run(() =>

WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs

@@ -88,5 +88,22 @@ namespace WelsonJS.Launcher
 
             return path;
         }
+
+        public static string GetAppDataPath()
+        {
+            string path = Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+                "welsonjs"
+            );
+
+            Directory.CreateDirectory(path);
+
+            if (!Directory.Exists(path))
+            {
+                throw new IOException("Failed to create directory: " + path);
+            }
+
+            return path;
+        }
     }
 }