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

SVSim.EmulatedEntrypoint/Services/BattlePassPointSource.cs

@@ -0,0 +1,12 @@
+namespace SVSim.EmulatedEntrypoint.Services;
+
+/// <summary>
+/// Which categorized field on <c>battle_pass_gauge_info</c> a point grant feeds. Mirrors the
+/// breakdown shown by <c>BattlePassResultPanel</c> after a win.
+/// </summary>
+public enum BattlePassPointSource
+{
+    BattleResult,
+    DailyMission,
+    BattlePassMission,
+}