Add auto-update check and DDC/CI timeout fix

- Auto-update checker on startup via Gitea API
- Balloon notification when update available, click to download
- 5-second timeout on DDC/CI commands to prevent hangs
- Simplified version scheme to match release tags
- Workflow auto-updates version in csproj from tag

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Library/Helpers/ConsoleHelper.cs

@@ -19,7 +19,7 @@ internal class ConsoleHelper
             }
         };
 
-    public static async Task<string> ExecuteCommand(string command)
+    public static async Task<string> ExecuteCommand(string command, int timeoutMs = 5000)
     {
         Process p = new Process();
         p.StartInfo.UseShellExecute = false;
@@ -27,10 +27,19 @@ internal class ConsoleHelper
         p.StartInfo.RedirectStandardOutput = true;
         p.StartInfo.FileName = command;
         p.Start();
-        var output = await p.StandardOutput.ReadToEndAsync();
-        await p.WaitForExitAsync();
 
-        return output;
+        using var cts = new CancellationTokenSource(timeoutMs);
+        try
+        {
+            var output = await p.StandardOutput.ReadToEndAsync(cts.Token);
+            await p.WaitForExitAsync(cts.Token);
+            return output;
+        }
+        catch (OperationCanceledException)
+        {
+            try { p.Kill(); } catch { }
+            return string.Empty;
+        }
     }
 
     public static async Task<string> CmdCommandAsync(params string[] cmds) =>
@@ -40,6 +49,11 @@ internal class ConsoleHelper
         Command(cmdFileName, cmds);
 
     public static async Task<string> CommandAsync(string fileName, params string[] cmds)
+    {
+        return await CommandAsync(fileName, 5000, cmds);
+    }
+
+    public static async Task<string> CommandAsync(string fileName, int timeoutMs, params string[] cmds)
     {
         var p = CreatProcess(fileName);
         p.Start();
@@ -48,14 +62,24 @@ internal class ConsoleHelper
             p.StandardInput.WriteLine(cmd);
         }
         p.StandardInput.WriteLine("exit");
-        var result = await p.StandardOutput.ReadToEndAsync();
-        var error = await p.StandardError.ReadToEndAsync();
-        if (!string.IsNullOrWhiteSpace(error))
-            result = result + "\r\n<Error Message>:\r\n" + error;
-        await p.WaitForExitAsync();
-        p.Close();
-        Debug.WriteLine(result);
-        return result;
+
+        using var cts = new CancellationTokenSource(timeoutMs);
+        try
+        {
+            var result = await p.StandardOutput.ReadToEndAsync(cts.Token);
+            var error = await p.StandardError.ReadToEndAsync(cts.Token);
+            if (!string.IsNullOrWhiteSpace(error))
+                result = result + "\r\n<Error Message>:\r\n" + error;
+            await p.WaitForExitAsync(cts.Token);
+            p.Close();
+            Debug.WriteLine(result);
+            return result;
+        }
+        catch (OperationCanceledException)
+        {
+            try { p.Kill(); } catch { }
+            return string.Empty;
+        }
     }
 
     public static string Command(string fileName, params string[] cmds)