feat(repo): IArenaTwoPickRewardRepository + tests

Adds GetRewardsByWinCountAsync and GetMaxWinCountAsync (short-circuits
to 0 on empty table). Registers as AddTransient in Program.cs alongside
other global catalog repos. 3 NUnit tests pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.UnitTests/Repositories/ArenaTwoPickRewardRepositoryTests.cs

@@ -0,0 +1,56 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using SVSim.Bootstrap.Importers;
+using SVSim.Database;
+using SVSim.Database.Repositories.Globals;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Repositories;
+
+public class ArenaTwoPickRewardRepositoryTests
+{
+    private static async Task<SVSimDbContext> SeededContextAsync()
+    {
+        var factory = new SVSimTestFactory();
+        var scope = factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        await db.Database.EnsureCreatedAsync();
+        await new ArenaTwoPickRewardImporter()
+            .ImportAsync(db, Path.Combine(AppContext.BaseDirectory, "Data", "seeds"));
+        return db;
+    }
+
+    [Test]
+    public async Task GetRewardsByWinCount_returns_two_rows_for_each_win_count()
+    {
+        await using var db = await SeededContextAsync();
+        var repo = new ArenaTwoPickRewardRepository(db);
+
+        for (int w = 0; w <= 7; w++)
+        {
+            var rows = await repo.GetRewardsByWinCountAsync(w);
+            Assert.That(rows.Count, Is.EqualTo(2), $"WinCount={w} should have 2 reward rows");
+        }
+    }
+
+    [Test]
+    public async Task GetMaxWinCount_returns_7()
+    {
+        await using var db = await SeededContextAsync();
+        var repo = new ArenaTwoPickRewardRepository(db);
+        var max = await repo.GetMaxWinCountAsync();
+        Assert.That(max, Is.EqualTo(7));
+    }
+
+    [Test]
+    public async Task GetMaxWinCount_returns_0_when_catalog_empty()
+    {
+        var factory = new SVSimTestFactory();
+        using var scope = factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        await db.Database.EnsureCreatedAsync();
+        var repo = new ArenaTwoPickRewardRepository(db);
+        var max = await repo.GetMaxWinCountAsync();
+        Assert.That(max, Is.EqualTo(0));
+    }
+}