Rewrite as standalone C# WinForms app

Replace the Office Web Add-in with a native Windows application.
The web add-in required Exchange/M365 for registration which is
not available in all customer environments (standalone Office,
POP/IMAP only).

The new app:
- Uses COM Interop to access Outlook contacts directly
- Communicates with Starface REST API (accepts self-signed certs)
- Runs as System Tray app with optional auto-sync
- Profile-based config stored in %AppData%
- No webserver, no certificates, no Exchange, no M365 needed
- Inno Setup installer for clean MSI-style deployment
- Works with any Outlook version (Classic and New)

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

installer/setup.iss

@@ -0,0 +1,82 @@
+; Inno Setup Script fuer Starface Outlook Sync
+; Erfordert Inno Setup 6.x (https://jrsoftware.org/isinfo.php)
+
+#define MyAppName "Starface Outlook Sync"
+#define MyAppVersion "0.0.0.1"
+#define MyAppPublisher "HackerSoft - Hacker-Net Telekommunikation"
+#define MyAppURL "https://www.hacker-net.de"
+#define MyAppExeName "StarfaceOutlookSync.exe"
+
+[Setup]
+AppId={{B7E3F4A1-2C8D-4E5F-9A0B-1D2E3F4A5B6C}
+AppName={#MyAppName}
+AppVersion={#MyAppVersion}
+AppVerName={#MyAppName} {#MyAppVersion}
+AppPublisher={#MyAppPublisher}
+AppPublisherURL={#MyAppURL}
+DefaultDirName={autopf}\StarfaceOutlookSync
+DefaultGroupName={#MyAppName}
+DisableProgramGroupPage=yes
+OutputDir=..\dist
+OutputBaseFilename=StarfaceOutlookSync_Setup_{#MyAppVersion}
+Compression=lzma
+SolidCompression=yes
+WizardStyle=modern
+PrivilegesRequired=admin
+ArchitecturesAllowed=x64compatible
+ArchitecturesInstallIn64BitMode=x64compatible
+UninstallDisplayIcon={app}\{#MyAppExeName}
+
+[Languages]
+Name: "german"; MessagesFile: "compiler:Languages\German.isl"
+
+[Tasks]
+Name: "desktopicon"; Description: "Desktop-Verknuepfung erstellen"; GroupDescription: "Zusaetzliche Optionen:"
+Name: "autostart"; Description: "Bei Windows-Anmeldung automatisch starten"; GroupDescription: "Zusaetzliche Optionen:"; Flags: checkedonce
+
+[Files]
+; Hauptanwendung - Pfad anpassen nach Build
+Source: "..\src\StarfaceOutlookSync\bin\Release\net4.8\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+
+[Icons]
+Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
+Name: "{group}\{#MyAppName} deinstallieren"; Filename: "{uninstallexe}"
+Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
+
+[Registry]
+; Autostart
+Root: HKCU; Subkey: "Software\Microsoft\Windows\CurrentVersion\Run"; ValueType: string; ValueName: "StarfaceOutlookSync"; ValueData: """{app}\{#MyAppExeName}"""; Flags: uninsdeletevalue; Tasks: autostart
+
+[Run]
+Filename: "{app}\{#MyAppExeName}"; Description: "{#MyAppName} jetzt starten"; Flags: nowait postinstall skipifsilent
+
+[UninstallRun]
+Filename: "taskkill"; Parameters: "/F /IM {#MyAppExeName}"; Flags: runhidden; RunOnceId: "KillApp"
+
+[UninstallDelete]
+Type: filesandordirs; Name: "{userappdata}\StarfaceOutlookSync"
+
+[Code]
+// Pruefe ob .NET Framework 4.8 installiert ist
+function IsDotNetInstalled(): Boolean;
+var
+  Version: Cardinal;
+begin
+  Result := RegQueryDWordValue(HKLM, 'SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full', 'Release', Version);
+  if Result then
+    Result := Version >= 528040; // .NET 4.8
+end;
+
+function InitializeSetup(): Boolean;
+begin
+  Result := True;
+
+  if not IsDotNetInstalled() then
+  begin
+    MsgBox('.NET Framework 4.8 oder hoeher wird benoetigt.' + #13#10 +
+           'Bitte installieren Sie es von:' + #13#10 +
+           'https://dotnet.microsoft.com/download/dotnet-framework/net48',
+           mbError, MB_OK);
+    Result := False;
+  end;
+end;