v1.15 — PowerShell edition + repo restructure

- New powershell/InstaSoftOfficeTool.ps1: single-file WPF GUI version
  - Same Fluent Design UI, no compilation needed
  - Runs on any Windows 7+ with PowerShell 5.1 (built-in)
  - Chrome won't flag .ps1 files as "rarely downloaded"
  - Auto-elevates to admin
- Moved C# source to src/ subfolder
- Updated .gitignore for nested bin/obj folders

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Pages/ProductKeyDialog.xaml.cs

@@ -1,124 +0,0 @@
-using System;
-using System.Text.RegularExpressions;
-using System.Threading.Tasks;
-using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Input;
-
-namespace InstaSoftOfficeTool.Pages
-{
-    public partial class ProductKeyDialog : UserControl
-    {
-        private TaskCompletionSource<string> _tcs;
-        private readonly TextBox[] _keyBoxes;
-        private bool _suppress;
-
-        public ProductKeyDialog()
-        {
-            InitializeComponent();
-            _keyBoxes = new[] { DKey1, DKey2, DKey3, DKey4, DKey5 };
-
-            foreach (var box in _keyBoxes)
-            {
-                DataObject.AddPastingHandler(box, OnPaste);
-            }
-        }
-
-        public Task<string> ShowAsync()
-        {
-            foreach (var box in _keyBoxes) box.Text = "";
-            BtnOk.IsEnabled = false;
-            Visibility = Visibility.Visible;
-            DKey1.Focus();
-            _tcs = new TaskCompletionSource<string>();
-            return _tcs.Task;
-        }
-
-        private string GetFullKey()
-        {
-            return string.Join("-", DKey1.Text, DKey2.Text, DKey3.Text, DKey4.Text, DKey5.Text).ToUpper();
-        }
-
-        private bool IsKeyComplete()
-        {
-            foreach (var box in _keyBoxes)
-            {
-                if (box.Text.Length != 5 || !Regex.IsMatch(box.Text, "^[A-Za-z0-9]{5}$"))
-                    return false;
-            }
-            return true;
-        }
-
-        private void KeyBox_TextChanged(object sender, TextChangedEventArgs e)
-        {
-            if (_suppress) return;
-            var tb = (TextBox)sender;
-
-            var cleaned = Regex.Replace(tb.Text, "[^A-Za-z0-9]", "");
-            if (cleaned != tb.Text)
-            {
-                _suppress = true;
-                tb.Text = cleaned;
-                tb.CaretIndex = cleaned.Length;
-                _suppress = false;
-            }
-
-            if (tb.Text.Length == 5)
-            {
-                for (int i = 0; i < _keyBoxes.Length - 1; i++)
-                {
-                    if (_keyBoxes[i] == tb)
-                    {
-                        _keyBoxes[i + 1].Focus();
-                        break;
-                    }
-                }
-            }
-
-            BtnOk.IsEnabled = IsKeyComplete();
-        }
-
-        private void OnPaste(object sender, DataObjectPastingEventArgs e)
-        {
-            if (!e.DataObject.GetDataPresent(typeof(string))) return;
-            var pasted = (string)e.DataObject.GetData(typeof(string));
-            var allAlphaNum = Regex.Replace(pasted, "[^A-Za-z0-9]", "");
-
-            if (allAlphaNum.Length <= 5) return;
-
-            e.CancelCommand();
-            _suppress = true;
-            for (int i = 0; i < 5; i++)
-            {
-                int start = i * 5;
-                if (start < allAlphaNum.Length)
-                {
-                    int len = Math.Min(5, allAlphaNum.Length - start);
-                    _keyBoxes[i].Text = allAlphaNum.Substring(start, len).ToUpper();
-                }
-            }
-            _suppress = false;
-            _keyBoxes[4].Focus();
-            _keyBoxes[4].CaretIndex = _keyBoxes[4].Text.Length;
-            BtnOk.IsEnabled = IsKeyComplete();
-        }
-
-        private void BtnOk_Click(object sender, RoutedEventArgs e)
-        {
-            Visibility = Visibility.Collapsed;
-            _tcs?.TrySetResult(GetFullKey());
-        }
-
-        private void BtnCancel_Click(object sender, RoutedEventArgs e)
-        {
-            Visibility = Visibility.Collapsed;
-            _tcs?.TrySetResult(null);
-        }
-
-        private void Backdrop_MouseDown(object sender, MouseButtonEventArgs e)
-        {
-            Visibility = Visibility.Collapsed;
-            _tcs?.TrySetResult(null);
-        }
-    }
-}