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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>
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src/IBKRTrader.Core/Workers/BuiltIn/BackupWorker.cs

@@ -1,6 +1,5 @@
 using IBKRTrader.Core.Persistence.Ef;
 using Microsoft.EntityFrameworkCore;
-using IBKRTrader.Core.Database;
 using IBKRTrader.Core.Logging;
 using IBKRTrader.Core.Settings;
 

src/IBKRTrader.Core/Workers/BuiltIn/IBKRInstrumentSyncWorker.cs

@@ -1,6 +1,5 @@
 using IBKRTrader.Core.Persistence.Ef;
 using Microsoft.EntityFrameworkCore;
-using IBKRTrader.Core.Database;
 using IBKRTrader.Core.IBKR;
 using IBKRTrader.Core.Logging;
 using IBKRTrader.Core.Settings;

src/IBKRTrader.Core/Workers/BuiltIn/IBKRPriceHistoryWorker.cs

@@ -1,6 +1,5 @@
 using IBKRTrader.Core.Persistence.Ef;
 using Microsoft.EntityFrameworkCore;
-using IBKRTrader.Core.Database;
 using IBKRTrader.Core.IBKR;
 using IBKRTrader.Core.Logging;
 using IBKRTrader.Core.Settings;

src/IBKRTrader.Core/Workers/BuiltIn/WebApiService.cs

@@ -3,7 +3,6 @@ using Microsoft.EntityFrameworkCore;
 using System.Net;
 using System.Text;
 using System.Text.Json;
-using IBKRTrader.Core.Database;
 using IBKRTrader.Core.Logging;
 using IBKRTrader.Core.Settings;
 

src/IBKRTrader.Core/Workers/BuiltIn/WebserverService.cs

@@ -2,7 +2,6 @@ using IBKRTrader.Core.Persistence.Ef;
 using Microsoft.EntityFrameworkCore;
 using System.Net;
 using System.Text;
-using IBKRTrader.Core.Database;
 using IBKRTrader.Core.Logging;
 using IBKRTrader.Core.Settings;