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>

DellMonitorControl/UpdateChecker.cs

@@ -0,0 +1,119 @@
+using System;
+using System.Diagnostics;
+using System.Net.Http;
+using System.Reflection;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace DellMonitorControl;
+
+public class UpdateChecker
+{
+    private const string ReleasesApiUrl = "https://git.marketally.com/api/v1/repos/misc/ControlMyMonitorManagement/releases/latest";
+    private static readonly HttpClient _httpClient = new() { Timeout = TimeSpan.FromSeconds(10) };
+
+    public static Version CurrentVersion => Assembly.GetExecutingAssembly().GetName().Version ?? new Version(1, 0, 0);
+
+    public static async Task<UpdateInfo?> CheckForUpdateAsync()
+    {
+        try
+        {
+            DebugLogger.Log($"Checking for updates... Current version: {CurrentVersion}");
+
+            var response = await _httpClient.GetStringAsync(ReleasesApiUrl);
+            var release = JsonSerializer.Deserialize<GiteaRelease>(response);
+
+            if (release == null || string.IsNullOrEmpty(release.tag_name))
+            {
+                DebugLogger.Log("No release info found");
+                return null;
+            }
+
+            var latestVersionStr = release.tag_name.TrimStart('v', 'V');
+            if (!Version.TryParse(latestVersionStr, out var latestVersion))
+            {
+                DebugLogger.Log($"Could not parse version: {release.tag_name}");
+                return null;
+            }
+
+            DebugLogger.Log($"Latest version: {latestVersion}");
+
+            if (latestVersion > CurrentVersion)
+            {
+                // Find the installer asset
+                string? downloadUrl = null;
+                if (release.assets != null)
+                {
+                    foreach (var asset in release.assets)
+                    {
+                        if (asset.name?.EndsWith(".exe", StringComparison.OrdinalIgnoreCase) == true)
+                        {
+                            downloadUrl = asset.browser_download_url;
+                            break;
+                        }
+                    }
+                }
+
+                // Fallback to release page if no direct download
+                downloadUrl ??= release.html_url;
+
+                DebugLogger.Log($"Update available: {latestVersion}, URL: {downloadUrl}");
+
+                return new UpdateInfo
+                {
+                    CurrentVersion = CurrentVersion,
+                    LatestVersion = latestVersion,
+                    DownloadUrl = downloadUrl ?? "",
+                    ReleaseNotes = release.body ?? ""
+                };
+            }
+
+            DebugLogger.Log("No update available");
+            return null;
+        }
+        catch (Exception ex)
+        {
+            DebugLogger.LogError("Update check failed", ex);
+            return null;
+        }
+    }
+
+    public static void OpenDownloadPage(string url)
+    {
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = url,
+                UseShellExecute = true
+            });
+        }
+        catch (Exception ex)
+        {
+            DebugLogger.LogError("Failed to open download page", ex);
+        }
+    }
+}
+
+public class UpdateInfo
+{
+    public Version CurrentVersion { get; set; } = new(1, 0, 0);
+    public Version LatestVersion { get; set; } = new(1, 0, 0);
+    public string DownloadUrl { get; set; } = "";
+    public string ReleaseNotes { get; set; } = "";
+}
+
+public class GiteaRelease
+{
+    public string? tag_name { get; set; }
+    public string? name { get; set; }
+    public string? body { get; set; }
+    public string? html_url { get; set; }
+    public GiteaAsset[]? assets { get; set; }
+}
+
+public class GiteaAsset
+{
+    public string? name { get; set; }
+    public string? browser_download_url { get; set; }
+}