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>

src/StarfaceOutlookSync/StarfaceOutlookSync.csproj

@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net4.8</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ApplicationIcon>Resources\app.ico</ApplicationIcon>
+    <AssemblyTitle>Starface Outlook Sync</AssemblyTitle>
+    <Company>HackerSoft - Hacker-Net Telekommunikation</Company>
+    <Product>Starface Outlook Sync</Product>
+    <Version>0.0.0.1</Version>
+    <AssemblyVersion>0.0.0.1</AssemblyVersion>
+    <FileVersion>0.0.0.1</FileVersion>
+    <Description>Synchronisiert Outlook-Kontakte mit Starface Telefonanlage</Description>
+    <Copyright>Stefan Hacker - HackerSoft</Copyright>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="Microsoft.Office.Interop.Outlook">
+      <HintPath>$(ProgramFiles)\Microsoft Office\root\Office16\ADDINS\Microsoft.Office.Interop.Outlook.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\app.ico" />
+  </ItemGroup>
+
+</Project>