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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/Modules/ModuleRegistryTests.cs

@@ -0,0 +1,49 @@
+using FluentAssertions;
+using IBKRTrader.Core.Modules;
+using IBKRTrader.Core.Workers;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace IBKRTrader.Tests.Modules;
+
+[Trait("cat", "unit")]
+public class ModuleRegistryTests
+{
+    private sealed class FakeModule(string key) : IModule
+    {
+        public string Key         => key;
+        public string DisplayName => $"Fake {key}";
+        public string Description => "test";
+        public string Version     => "0.0.1";
+
+        public void RegisterServices(IServiceCollection services) { }
+        public Task InitializeAsync(IServiceProvider provider) => Task.CompletedTask;
+        public IEnumerable<IWorker> GetWorkers(IServiceProvider provider) => [];
+        public Form CreateWindow(IServiceProvider provider) => new();
+    }
+
+    [Fact]
+    public void Modules_PreservesRegistrationOrder()
+    {
+        var registry = new ModuleRegistry([new FakeModule("A"), new FakeModule("B")]);
+
+        registry.Modules.Select(m => m.Key).Should().ContainInOrder("A", "B");
+    }
+
+    [Fact]
+    public void Find_IsCaseInsensitive()
+    {
+        var registry = new ModuleRegistry([new FakeModule("CT")]);
+
+        registry.Find("ct").Should().NotBeNull();
+        registry.Find("CT").Should().NotBeNull();
+        registry.Find("XX").Should().BeNull();
+    }
+
+    [Fact]
+    public void Ctor_NullModules_Throws()
+    {
+        var act = () => new ModuleRegistry(null!);
+
+        act.Should().Throw<ArgumentNullException>();
+    }
+}