@

R3 Slice 4: IBKR-Marktdaten auf EF; Dapper vollstaendig entfernt

- 3 IBKR-Entities (IBKRInstrument/IBKRMarketBar/IBKRExternalIdentifier) im CoreDbContext
  (core_ibkr_instruments/_market_data/_external_identifiers); Migration AddIbkr
- IBKRMarketDataRepository von Dapper auf EF (IDbContextFactory<CoreDbContext>);
  Cross-Modul-Query (ct_trade) via Database.SqlQueryRaw
- DatabaseService, IBKRMigrations, Dapper-Package entfernt; Laufzeit-Migrationen komplett weg
  (Schema extern via dotnet ef database update)
- Tests: +4 IBKRMarketDataRepository (EF-InMemory) -> 43/43 gruen; Build + smoke-ui + App-Start ok

R3 abgeschlossen: Persistenz vollstaendig auf EF Core.

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

src/IBKRTrader.Core/IBKRTrader.Core.csproj

@@ -11,8 +11,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MySqlConnector" Version="2.4.0" />
-    <PackageReference Include="Dapper" Version="2.1.35" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.4" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="9.0.4" />
     <!-- EF Core / Pomelo (MariaDB 11.8.6). EF 8 laeuft auf net10. -->