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R3 Slice 1: EF-Core-Infrastruktur im Core + InitialCore-Migration

- Pomelo.EntityFrameworkCore.MySql 8.0.3 + EF Core Design 8.0.11 (Core), NuGet-Allowlist erweitert
- Configuration/DatabaseOptions + DatabaseServerVersion (MariaDB 11.8.6 gepinnt)
- Persistence/Entities: CorePosition, CoreTrade, CoreBudget, CoreWorkerLog, CoreSetting
- Persistence/Ef/CoreDbContext (core_-Tabellen) + Design-Time-Factory (env IBKRTRADER_MYSQL)
- DependencyInjection/AddCorePersistence (AddDbContextFactory), in Program verdrahtet
  (Connection aus appsettings.Local.json)
- EF-Migration InitialCore erzeugt (5 core_-Tabellen)
- Consumer noch auf Dapper (folgt in Slice 2); Build + 30/30 Tests + smoke-ui gruen

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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src/IBKRTrader.Core/DependencyInjection/ServiceCollectionExtensions.cs

@@ -0,0 +1,21 @@
+using IBKRTrader.Core.Configuration;
+using IBKRTrader.Core.Persistence.Ef;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace IBKRTrader.Core.DependencyInjection;
+
+public static class ServiceCollectionExtensions
+{
+    /// <summary>
+    /// Registriert die Core-Persistenzschicht (EF Core / Pomelo / MariaDB) über einen
+    /// DbContextFactory (thread-safe, kurzlebiger Context je Operation).
+    /// </summary>
+    public static IServiceCollection AddCorePersistence(this IServiceCollection services, DatabaseOptions options)
+    {
+        services.AddDbContextFactory<CoreDbContext>(o =>
+            o.UseMySql(options.MySqlConnectionString, DatabaseServerVersion.Value));
+
+        return services;
+    }
+}