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R1: Umbau auf Multi-Projekt-Struktur (Vorbild PolytraderSharp)

Kurskorrektur: Vorbild ist PolytraderSharp (C#), nicht die veraltete Python-Version.
Reiner Strukturumbau, Verhalten unveraendert.

- src/IBKRTrader.Core (classlib): Core-Code + UI-Contract (ModuleFormBase, WindowManager)
- src/IBKRTrader.Modules.CongressTrading (classlib, referenziert nur Core)
- Root: IBKRTrader.App (WinExe) referenziert Core + Modul
- tests/IBKRTrader.Tests: Referenzen auf Core + Modul
- Neue .slnx; ungenutztes HtmlAgilityPack entfernt
- docs/ARCHITECTURE.md: korrigierter Ziel-Stand + R-Phasenplan
- Build + 38/38 Tests gruen; App startet

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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tests/IBKRTrader.Tests/IBKRTrader.Tests.csproj

@@ -0,0 +1,39 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <!-- net10.0-windows + WinForms, weil das Testprojekt die WinForms-Hauptassembly referenziert -->
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <SatelliteResourceLanguages>en</SatelliteResourceLanguages>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="FluentAssertions" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\IBKRTrader.Core\IBKRTrader.Core.csproj" />
+    <ProjectReference Include="..\..\src\IBKRTrader.Modules.CongressTrading\IBKRTrader.Modules.CongressTrading.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <!-- Test-Fixture: gespeicherte capitoltrades.com-Seite (kein Netzzugriff im Test) -->
+    <Content Include="..\..\ct_raw.html" Link="Fixtures\ct_raw.html">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+</Project>