Fix Avalonia IDE startup by moving packet workspace off the executable directory (#18)

* Initial plan

* fix: use user-writable packet workspace

Agent-Logs-Url: https://github.com/GeneralLibrary/GeneralUpdate.Tools/sessions/3713e717-448c-4e9c-b05a-40d972079fc4

Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>

* style: rename packet workspace variable

Agent-Logs-Url: https://github.com/GeneralLibrary/GeneralUpdate.Tools/sessions/3713e717-448c-4e9c-b05a-40d972079fc4

Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>

Author: Copilot

src/ViewModels/PacketViewModel.cs

@@ -355,7 +355,8 @@ private async Task<string> CreateConfigInfoFile()
             };
 
             var json = JsonConvert.SerializeObject(configInfo, Formatting.Indented);
-            var configFilePath = Path.Combine(AppContext.BaseDirectory, "update_config.json");
+            Directory.CreateDirectory(ConfigModel.PatchDirectory);
+            var configFilePath = Path.Combine(ConfigModel.PatchDirectory, "update_config.json");
 
             await File.WriteAllTextAsync(configFilePath, json, Encoding.UTF8);
 
@@ -482,22 +483,33 @@ private static string SearchExeFileAndGetDirectory(string rootDirectory, string
 
     private void CreateDirectory()
     {
-        var baseDir = AppContext.BaseDirectory;
+        var baseDir = GetApplicationDataDirectory();
 
-        var packateDir = Path.Combine(baseDir, "packets");
-        if (!Directory.Exists(packateDir))
+        var packetDir = Path.Combine(baseDir, "packets");
+        if (!Directory.Exists(packetDir))
         {
-            Directory.CreateDirectory(packateDir);
+            Directory.CreateDirectory(packetDir);
         }
 
-        var patchDir = Path.Combine(packateDir, "patch");
+        var patchDir = Path.Combine(packetDir, "patch");
         if (!Directory.Exists(patchDir))
         {
             Directory.CreateDirectory(patchDir);
         }
 
         ConfigModel.PatchDirectory = patchDir;
     }
+
+    private static string GetApplicationDataDirectory()
+    {
+        var localApplicationData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        if (string.IsNullOrWhiteSpace(localApplicationData))
+        {
+            return AppContext.BaseDirectory;
+        }
+
+        return Path.Combine(localApplicationData, "GeneralUpdate.Tool.Avalonia");
+    }
 
     static void OpenFileDirectoryAndSelectFile(string filePath)
     {
@@ -513,4 +525,4 @@ static void OpenFileDirectoryAndSelectFile(string filePath)
             UseShellExecute = true
         });
     }
-}
+}