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R2: Generic Host + Modul-Vertrag + Shell-UI (PolytraderSharp-Konzept)

- Core/Modularity: neuer IModule (Name, DbPrefix, RegisterServices(services,config),
  RegisterUi(host,sp), StartAsync/StopAsync, GetActivationBlocker) + ModuleView
  + IModuleUiHost + WindowMenu. Alte IModule/ModuleRegistry/WindowManager/ModuleFormBase entfernt.
- Program.cs: Host.CreateDefaultBuilder + IConfiguration (appsettings.json/.Local.json);
  Core-Services registriert, Module via RegisterServices, Views via RegisterUi.
- UI: ShellUiHost (Einzelinstanz-Fenster + Fenster-Menue), LauncherForm als Shell
  (Buttons je View), Core-Views Logs/Settings/Workers als eigene Fenster.
- CongressTrading auf neuen Vertrag; Worker als IWorker registriert.
- --smoke-ui Headless-Test (konstruiert jede View + Launcher).
- appsettings.Local.json gitignored.
- Tests angepasst -> 30/30 gruen; Build + Smoke-UI + App-Start verifiziert.

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

@@ -14,6 +14,7 @@
     <PackageReference Include="MySqlConnector" Version="2.4.0" />
     <PackageReference Include="Dapper" Version="2.1.35" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.4" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="9.0.4" />
   </ItemGroup>
 
   <!-- Erlaubt dem Testprojekt, interne Helfer zu testen. -->