Deck list work

SVSim.Bootstrap/DesignTimeDbContextFactory.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+using Microsoft.Extensions.Logging.Abstractions;
+using SVSim.Database;
+
+namespace SVSim.Bootstrap;
+
+/// <summary>
+/// Lets `dotnet ef migrations add` instantiate SVSimDbContext at design time. The runtime ctor
+/// takes an ILogger which EF's tooling can't resolve without DI; this factory bypasses that.
+/// Connection string here only needs to be valid Npgsql syntax — EF doesn't actually connect
+/// during migration scaffolding.
+/// </summary>
+public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<SVSimDbContext>
+{
+    public SVSimDbContext CreateDbContext(string[] args)
+    {
+        var options = new DbContextOptionsBuilder<SVSimDbContext>()
+            .UseNpgsql("Host=localhost;Database=svsim;Username=postgres;password=postgres")
+            .Options;
+        return new SVSimDbContext(NullLogger<SVSimDbContext>.Instance, options);
+    }
+}