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

SVSim.Database/Enums/BattlePassTrack.cs

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+namespace SVSim.Database.Enums;
+
+/// <summary>
+/// Reward track on a battle pass season. Wire shape uses the section keys
+/// <c>"normal"</c> and <c>"premium"</c> under <c>reward_info</c>.
+/// </summary>
+public enum BattlePassTrack
+{
+    Normal = 0,
+    Premium = 1,
+}

SVSim.Database/Models/BattlePassRewardEntry.cs

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+using SVSim.Database.Common;
+using SVSim.Database.Enums;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// One reward cell on a battle pass season (track × level). Capture shows at most one
+/// reward per (season, track, level) — enforced by unique index in DbContext.
+/// RewardType integers come from <see cref="UserGoodsType"/>.
+/// </summary>
+public class BattlePassRewardEntry : BaseEntity<long>
+{
+    public int SeasonId { get; set; }
+    public BattlePassTrack Track { get; set; }
+    public int Level { get; set; }
+    public int RewardType { get; set; }
+    public long RewardDetailId { get; set; }
+    public int RewardNumber { get; set; }
+    public bool IsAppealExclusion { get; set; }
+
+    public BattlePassSeasonEntry Season { get; set; } = null!;
+}

SVSim.Database/Models/BattlePassSeasonEntry.cs

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+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();
+}