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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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NuGet.config

@@ -18,6 +18,12 @@
       <package pattern="Dapper" />
       <package pattern="HtmlAgilityPack" />
       <package pattern="Newtonsoft.Json" />
+      <!-- EF Core / Pomelo (MySQL/MariaDB) -->
+      <package pattern="Microsoft.EntityFrameworkCore.*" />
+      <package pattern="Pomelo.*" />
+      <package pattern="Humanizer.*" />
+      <package pattern="Mono.TextTemplating" />
+      <package pattern="dotnet-ef" />
       <!-- Test-Pakete -->
       <package pattern="xunit*" />
       <package pattern="NSubstitute" />