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/EditionPage.xaml.cs

@@ -1,80 +0,0 @@
-using System.Windows;
-using System.Windows.Controls;
-using InstaSoftOfficeTool.Models;
-
-namespace InstaSoftOfficeTool.Pages
-{
-    public partial class EditionPage : Page, IWizardPage
-    {
-        private readonly MainWindow _main;
-        private readonly InstallConfig _config;
-        private readonly OfficeEdition[] _editions;
-
-        public EditionPage(MainWindow main, InstallConfig config)
-        {
-            InitializeComponent();
-            _main = main;
-            _config = config;
-            _editions = OfficeEdition.GetEditions(_config.Version);
-
-            SubtitleText.Text = _config.GetVersionDisplayName() + " — melyik kiadast szeretne?";
-
-            BuildEditionCards();
-        }
-
-        private void BuildEditionCards()
-        {
-            EditionPanel.Children.Clear();
-
-            for (int i = 0; i < _editions.Length; i++)
-            {
-                var edition = _editions[i];
-                var rb = new RadioButton
-                {
-                    GroupName = "Edition",
-                    IsChecked = i == 0 || (_config.Edition != null && _config.Edition.ProductId == edition.ProductId),
-                    Style = (Style)FindResource("CardRadioButton"),
-                    Margin = new Thickness(0, 0, 0, 10),
-                    Tag = i
-                };
-
-                var sp = new StackPanel { Margin = new Thickness(8, 2, 8, 2) };
-
-                var titleBlock = new TextBlock
-                {
-                    Text = edition.DisplayName,
-                    FontSize = 18,
-                    FontWeight = FontWeights.SemiBold
-                };
-                sp.Children.Add(titleBlock);
-
-                var descBlock = new TextBlock
-                {
-                    Text = edition.Description,
-                    FontSize = 12,
-                    Foreground = (System.Windows.Media.Brush)FindResource("TextSecondaryBrush"),
-                    TextWrapping = TextWrapping.Wrap,
-                    Margin = new Thickness(0, 2, 0, 0)
-                };
-                sp.Children.Add(descBlock);
-
-                rb.Content = sp;
-                EditionPanel.Children.Add(rb);
-            }
-        }
-
-        public bool Validate()
-        {
-            foreach (var child in EditionPanel.Children)
-            {
-                if (child is RadioButton rb && rb.IsChecked == true)
-                {
-                    int idx = (int)rb.Tag;
-                    _config.Edition = _editions[idx];
-                    return true;
-                }
-            }
-            return false;
-        }
-    }
-}