Phase 5: AccountState-Split (Copytrading-Limits -> Modul)

- Copytrading-Detail-Einstellungen (PerMarketLimit, MaxBuyPrice, PerMasterLimit,
  Zeit-Limits, PreRedeemLimit, ProfitTarget, MaxPriceDifference) aus dem Core-
  AccountState in das Modul-Modell CopyTradingAccountSettings verschoben.
- CopyTradingState.AccountSettings + GetAccountSettings(accountId) (Default-safe).
- Consumer umgestellt: CopyTradingEngine, TraderMonitorService, PolymarketWssClient,
  frm_main lesen die Limits jetzt aus den Account-Settings.
- Neues Modul-Repo ICopyTradingAccountSettingsRepository (Collection ct_account_settings),
  in CopyTradingModule registriert.
- StartupHydration: Settings laden + EINMALIGE Migration der Alt-Limits aus dem
  Roh-accounts-Dokument (keine konfigurierten Limits gehen verloren).
- Build 0 Fehler.

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

src/PolyTrader.Modules.CopyTrading/Persistence/ICopyTradingAccountSettingsRepository.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using PolyTraderSharp.Models;
+
+namespace PolyTrader.Modules.CopyTrading.Persistence
+{
+    /// <summary>
+    /// Persistenz der copytrading-spezifischen Account-Detail-Einstellungen
+    /// (Collection "ct_account_settings", Schlüssel = AccountId).
+    /// </summary>
+    public interface ICopyTradingAccountSettingsRepository
+    {
+        List<CopyTradingAccountSettings> GetAll();
+        CopyTradingAccountSettings? Get(int accountId);
+        void Upsert(CopyTradingAccountSettings settings);
+        void Delete(int accountId);
+    }
+}

src/PolyTrader.Modules.CopyTrading/Persistence/MongoCopyTradingAccountSettingsRepository.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.Linq;
+using MongoDB.Driver;
+using PolyTraderSharp.Models;
+
+namespace PolyTrader.Modules.CopyTrading.Persistence
+{
+    public class MongoCopyTradingAccountSettingsRepository : ICopyTradingAccountSettingsRepository
+    {
+        private readonly IMongoCollection<CopyTradingAccountSettings> _col;
+
+        public MongoCopyTradingAccountSettingsRepository(IMongoDatabase db)
+        {
+            _col = db.GetCollection<CopyTradingAccountSettings>("ct_account_settings");
+        }
+
+        public List<CopyTradingAccountSettings> GetAll() => _col.Find(_ => true).ToList();
+
+        public CopyTradingAccountSettings? Get(int accountId) =>
+            _col.Find(x => x.AccountId == accountId).FirstOrDefault();
+
+        public void Upsert(CopyTradingAccountSettings settings) =>
+            _col.ReplaceOne(x => x.AccountId == settings.AccountId, settings, new ReplaceOptions { IsUpsert = true });
+
+        public void Delete(int accountId) => _col.DeleteOne(x => x.AccountId == accountId);
+    }
+}