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>

Services/ProcessRunner.cs

@@ -1,63 +0,0 @@
-using System;
-using System.Diagnostics;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace InstaSoftOfficeTool.Services
-{
-    public class ProcessRunner
-    {
-        public event Action<string> OutputReceived;
-
-        public async Task<int> RunAsync(string fileName, string arguments, bool redirectOutput = true)
-        {
-            var psi = new ProcessStartInfo
-            {
-                FileName = fileName,
-                Arguments = arguments,
-                UseShellExecute = false,
-                CreateNoWindow = true,
-                RedirectStandardOutput = redirectOutput,
-                RedirectStandardError = redirectOutput,
-                StandardOutputEncoding = redirectOutput ? Encoding.UTF8 : null,
-                StandardErrorEncoding = redirectOutput ? Encoding.UTF8 : null
-            };
-
-            using (var process = new Process { StartInfo = psi })
-            {
-                if (redirectOutput)
-                {
-                    process.OutputDataReceived += (s, e) =>
-                    {
-                        if (e.Data != null)
-                            OutputReceived?.Invoke(e.Data);
-                    };
-                    process.ErrorDataReceived += (s, e) =>
-                    {
-                        if (e.Data != null)
-                            OutputReceived?.Invoke("[HIBA] " + e.Data);
-                    };
-                }
-
-                process.Start();
-
-                if (redirectOutput)
-                {
-                    process.BeginOutputReadLine();
-                    process.BeginErrorReadLine();
-                }
-
-                await Task.Run(() => process.WaitForExit());
-                return process.ExitCode;
-            }
-        }
-
-        public async Task<string> RunAndCaptureAsync(string fileName, string arguments)
-        {
-            var sb = new StringBuilder();
-            OutputReceived += line => sb.AppendLine(line);
-            await RunAsync(fileName, arguments);
-            return sb.ToString();
-        }
-    }
-}