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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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src/IBKRTrader.Core/Logging/LoggingService.cs

@@ -0,0 +1,105 @@
+using System.Runtime.CompilerServices;
+
+namespace IBKRTrader.Core.Logging;
+
+/// <summary>
+/// Thread-sicherer Logging-Service.
+/// – Schreibt farbig in die RichTextBox (UI-Thread-safe via BeginInvoke)
+/// – Schreibt in Logs\{Module}\{Level}-dd-MM-yy.txt
+/// </summary>
+public class LoggingService
+{
+    private RichTextBox? _rtb;
+    private AppLogLevel  _minLevel = AppLogLevel.Info;
+    private readonly object _fileLock = new();
+
+    private static readonly string LogBaseDir =
+        Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Logs");
+
+    // ─── Konfiguration ────────────────────────────────────────────────────────
+
+    public void AttachRichTextBox(RichTextBox rtb) => _rtb = rtb;
+
+    public void SetMinLevel(AppLogLevel level) => _minLevel = level;
+
+    // ─── Öffentliche API ─────────────────────────────────────────────────────
+
+    public void Info (string module, string message, Exception? ex = null)
+        => Write(AppLogLevel.Info,  module, message, ex);
+
+    public void Warn (string module, string message, Exception? ex = null)
+        => Write(AppLogLevel.Warn,  module, message, ex);
+
+    public void Error(string module, string message, Exception? ex = null)
+        => Write(AppLogLevel.Error, module, message, ex);
+
+    public void Write(AppLogLevel level, string module, string message, Exception? ex = null)
+    {
+        if (level < _minLevel) return;
+        var entry = new LogEntry(DateTime.Now, level, module, message, ex);
+        WriteToFile(entry);
+        WriteToRtb(entry);
+    }
+
+    // ─── Datei ────────────────────────────────────────────────────────────────
+
+    private void WriteToFile(LogEntry e)
+    {
+        try
+        {
+            var dir = Path.Combine(LogBaseDir, e.Module);
+            Directory.CreateDirectory(dir);
+
+            var file = Path.Combine(dir, $"{e.Level}-{e.Timestamp:dd-MM-yy}.txt");
+            var line = $"[{e.Timestamp:HH:mm:ss}] {e.Message}";
+            if (e.Exception != null)
+                line += $"\r\n  {e.Exception}";
+
+            lock (_fileLock)
+                File.AppendAllText(file, line + "\r\n");
+        }
+        catch { /* Logging darf niemals abstürzen */ }
+    }
+
+    // ─── RichTextBox ──────────────────────────────────────────────────────────
+
+    private static readonly Color ColorInfo  = Color.FromArgb(150, 210, 150);
+    private static readonly Color ColorWarn  = Color.FromArgb(255, 190,  60);
+    private static readonly Color ColorError = Color.FromArgb(255,  80,  80);
+
+    private void WriteToRtb(LogEntry e)
+    {
+        if (_rtb == null) return;
+        try
+        {
+            var color = e.Level switch
+            {
+                AppLogLevel.Warn  => ColorWarn,
+                AppLogLevel.Error => ColorError,
+                _                 => ColorInfo
+            };
+            var text = $"[{e.Timestamp:HH:mm:ss}] [{e.Level.ToString().ToUpper(),-5}] [{e.Module}] {e.Message}";
+            if (e.Exception != null)
+                text += $"\r\n  {e.Exception.Message}";
+            text += "\r\n";
+
+            if (_rtb.InvokeRequired)
+                _rtb.BeginInvoke(() => AppendColored(text, color));
+            else
+                AppendColored(text, color);
+        }
+        catch { }
+    }
+
+    private void AppendColored(string text, Color color)
+    {
+        if (_rtb == null) return;
+        _rtb.SelectionStart  = _rtb.TextLength;
+        _rtb.SelectionLength = 0;
+        _rtb.SelectionColor  = color;
+        _rtb.AppendText(text);
+        _rtb.SelectionColor  = _rtb.ForeColor;
+        if (_rtb.TextLength > 0)
+            _rtb.ScrollToCaret();
+    }
+}