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/SummaryPage.xaml.cs

@@ -1,63 +0,0 @@
-using System.Linq;
-using System.Windows;
-using System.Windows.Controls;
-using InstaSoftOfficeTool.Models;
-using InstaSoftOfficeTool.Services;
-using Microsoft.Win32;
-
-namespace InstaSoftOfficeTool.Pages
-{
-    public partial class SummaryPage : Page, IWizardPage
-    {
-        private readonly MainWindow _main;
-        private readonly InstallConfig _config;
-        private string _generatedXml;
-
-        public SummaryPage(MainWindow main, InstallConfig config)
-        {
-            InitializeComponent();
-            _main = main;
-            _config = config;
-
-            Loaded += (s, e) => RefreshSummary();
-        }
-
-        private void RefreshSummary()
-        {
-            SumVersion.Text = _config.GetVersionDisplayName();
-            SumEdition.Text = _config.Edition?.DisplayName ?? "-";
-            SumArch.Text = _config.Architecture + "-bit";
-            SumLanguage.Text = _config.GetLanguageDisplayName() + " (" + _config.Language + ")";
-            SumKey.Text = string.IsNullOrEmpty(_config.ProductKey) ? "Nincs megadva" : _config.ProductKey;
-
-            if (_config.ExcludedApps.Count > 0)
-                SumExcluded.Text = string.Join(", ", _config.ExcludedApps);
-            else
-                SumExcluded.Text = "Nincs (minden alkalmaz\u00e1s telep\u00fcl)";
-
-            _generatedXml = OdtXmlGenerator.Generate(_config);
-            XmlPreview.Text = _generatedXml;
-        }
-
-        private void BtnSaveXml_Click(object sender, RoutedEventArgs e)
-        {
-            var dlg = new SaveFileDialog
-            {
-                Filter = "XML f\u00e1jl (*.xml)|*.xml",
-                FileName = "configuration.xml"
-            };
-
-            if (dlg.ShowDialog() == true)
-            {
-                System.IO.File.WriteAllText(dlg.FileName, _generatedXml);
-                MessageBox.Show("XML sikeresen mentve:\n" + dlg.FileName,
-                    "Ment\u00e9s", MessageBoxButton.OK, MessageBoxImage.Information);
-            }
-        }
-
-        public bool Validate()
-        {
-            return true;
-        }
-    }
-}