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.Database/Repositories/Globals/ArenaTwoPickRewardRepository.cs

@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Repositories.Globals;
+
+public class ArenaTwoPickRewardRepository : IArenaTwoPickRewardRepository
+{
+    private readonly SVSimDbContext _db;
+    public ArenaTwoPickRewardRepository(SVSimDbContext db) => _db = db;
+
+    public async Task<List<ArenaTwoPickReward>> GetRewardsByWinCountAsync(int winCount) =>
+        await _db.ArenaTwoPickRewards
+            .Where(r => r.WinCount == winCount)
+            .ToListAsync();
+
+    public async Task<int> GetMaxWinCountAsync()
+    {
+        if (!await _db.ArenaTwoPickRewards.AnyAsync()) return 0;
+        return await _db.ArenaTwoPickRewards.MaxAsync(r => r.WinCount);
+    }
+}

SVSim.Database/Repositories/Globals/IArenaTwoPickRewardRepository.cs

@@ -0,0 +1,9 @@
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Repositories.Globals;
+
+public interface IArenaTwoPickRewardRepository
+{
+    Task<List<ArenaTwoPickReward>> GetRewardsByWinCountAsync(int winCount);
+    Task<int> GetMaxWinCountAsync();
+}