feat(bp): add BattlePassSeasonEntry + BattlePassRewardEntry + BattlePassTrack enum

SVSim.Database/Models/BattlePassSeasonEntry.cs

@@ -0,0 +1,20 @@
+using SVSim.Database.Common;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// One battle pass season. Active season is resolved by time-window
+/// (StartDate &lt;= now &lt; EndDate). Rewards are loaded via Rewards collection.
+/// </summary>
+public class BattlePassSeasonEntry : BaseEntity<int>
+{
+    public string Name { get; set; } = "";
+    public int MaxLevel { get; set; }
+    public DateTimeOffset StartDate { get; set; }
+    public DateTimeOffset EndDate { get; set; }
+    public bool CanPurchase { get; set; }
+    public int PriceCrystal { get; set; }
+    public string Description { get; set; } = "";
+
+    public List<BattlePassRewardEntry> Rewards { get; set; } = new();
+}