Baseline: Ausgangszustand vor Modularisierung

Erster Commit des bestehenden monolithischen WinForms-Copytraders,
inklusive der Alt-Backups (*.bak), damit diese dauerhaft in der
Historie rekonstruierbar bleiben. Threema-Lib unter libs/ wurde
vendored (nested .git entfernt).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

libs/Threema-MsgApi-Net-Core/IcgSoftware.Threema.CoreMsgApi/Messages/TextMessage.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace IcgSoftware.Threema.CoreMsgApi.Messages
+{
+	/// <summary>
+	/// A text message that can be sent/received with end-to-end encryption via Threema.
+	/// </summary>
+	public class TextMessage : ThreemaMessage
+	{
+		public const int TYPE_CODE = 0x01;
+
+		private readonly string text;
+
+		public TextMessage(String text)
+		{
+			this.text = text;
+		}
+
+		public string Text { get { return text; } }
+
+		public override int GetTypeCode() {
+			return TYPE_CODE;
+		}
+
+		public override byte[] GetData()
+		{
+			return Encoding.UTF8.GetBytes(text);
+		}
+
+		public override string ToString()
+		{
+			return text;
+		}
+	}
+}