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>

Models/ClosedTrade.cs

@@ -0,0 +1,36 @@
+namespace PolyTraderSharp.Models
+{
+    public class ClosedTrade
+    {
+        [MongoDB.Bson.Serialization.Attributes.BsonId] public int TradeId { get; set; }
+        public int AccountId { get; set; }
+        public int SourceTraderId { get; set; }
+        public bool IsDemo { get; set; }
+
+        public string TokenId { get; set; } = string.Empty;
+        public string MarketSlug { get; set; } = string.Empty;
+        public string MarketQuestion { get; set; } = string.Empty;
+        public string Outcome { get; set; } = string.Empty;
+
+        public string Side { get; set; } = string.Empty;
+        public decimal EntryPrice { get; set; }
+        public decimal ExitPrice { get; set; }
+        public decimal Size { get; set; }
+
+        public decimal RealizedPnl { get; set; }
+        public decimal PnlPercent { get; set; }
+        public decimal TotalFees { get; set; }
+
+        public DateTime OpenedAt { get; set; }
+        public DateTime ClosedAt { get; set; }
+        public string ExitReason { get; set; } = string.Empty;
+    }
+    public class ClosedTradeRow : ClosedTrade
+    {
+        public string AccountName { get; set; } = string.Empty;
+        public string SourceTraderName { get; set; } = string.Empty;
+        
+        [System.ComponentModel.Browsable(false)]
+        public string SourceTraderAddress { get; set; } = string.Empty;
+    }
+}