feat(bp): IBattlePassService skeleton + level-curve method + DI

SVSim.EmulatedEntrypoint/Services/BattlePassService.cs

@@ -0,0 +1,28 @@
+using System.Globalization;
+using SVSim.Database.Repositories.BattlePass;
+using SVSim.EmulatedEntrypoint.Models.Dtos;
+
+namespace SVSim.EmulatedEntrypoint.Services;
+
+public sealed class BattlePassService : IBattlePassService
+{
+    private readonly IBattlePassRepository _bp;
+
+    public BattlePassService(IBattlePassRepository bp)
+    {
+        _bp = bp;
+    }
+
+    public async Task<IReadOnlyDictionary<string, BattlePassLevel>?> GetLevelCurveAsync(CancellationToken ct)
+    {
+        var rows = await _bp.GetLevelCurveAsync(ct);
+        if (rows.Count == 0) return null;
+        return rows.ToDictionary(
+            r => r.Level.ToString(CultureInfo.InvariantCulture),
+            r => new BattlePassLevel
+            {
+                Level = r.Level.ToString(CultureInfo.InvariantCulture),
+                RequiredPoint = r.RequiredPoint.ToString(CultureInfo.InvariantCulture),
+            });
+    }
+}