feat(autoupdate): detect install type

CarManagerV3/Util/InstallModeDetector.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using Microsoft.Win32;
+
+namespace CarManagerV3.Util
+{
+    public static class InstallModeDetector
+    {
+        private const string _keyPath = @"Software\Jaro Digital\CarManager3";
+        private const string KeyPath = _keyPath;
+        private const string ValueName = "InstallType";
+
+        public static bool IsInstalledViaMsi()
+        {
+            // Prefer HKLM if your MSI is per-machine; fallback to HKCU if per-user.
+            System.Diagnostics.Debug.WriteLine($"Checking registry for install type at HKLM\\{KeyPath} and HKCU\\{KeyPath}");
+            object? val =
+                Registry.GetValue($@"HKEY_LOCAL_MACHINE\{KeyPath}", ValueName, null)
+                ?? Registry.GetValue($@"HKEY_CURRENT_USER\{KeyPath}", ValueName, null);
+
+            return val is string s && string.Equals(s, "MSI", StringComparison.OrdinalIgnoreCase);
+        }
+
+        public static bool IsPortable() => !IsInstalledViaMsi();
+
+        public static string GetInstallType()
+        {
+            object? val =
+                Registry.GetValue($@"HKEY_LOCAL_MACHINE\{KeyPath}", ValueName, null)
+                ?? Registry.GetValue($@"HKEY_CURRENT_USER\{KeyPath}", ValueName, null);
+            return val as string ?? "Unknown";
+        }
+    }
+}