refactor: type reward_type columns as UserGoodsType enum

Replace bare `int RewardType` on 12 catalog/reward entities and GrantedReward
with the existing UserGoodsType enum. Verified against the decompiled client:
every wire reward_type decodes through the single Wizard.UserGoods.Type enum, so
one enum is correct across all endpoint families (item_type is a separate
Item.Type axis, left untouched). EF stores the enum as the same int column, so
there is no migration.

- Importers cast seed int -> UserGoodsType at the ingest boundary.
- New GrantedReward.ToRewardList() extension replaces 8 copy-pasted
  GrantedReward -> RewardListEntry projections.
- Fix 3 .ToString() sites that would otherwise emit enum names ("Crystal")
  instead of the int wire value ("2").
- Wire DTOs keep int; the enum is widened to int at the wire boundary only.

Build green; 962/962 tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.Database/Models/AchievementCatalogEntry.cs

@@ -1,4 +1,5 @@
 using SVSim.Database.Common;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -14,7 +15,7 @@ public class AchievementCatalogEntry
     public int Level { get; set; }
     public string Name { get; set; } = "";
     public int RequireNumber { get; set; }
-    public int RewardType { get; set; }
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
     public int OrderNum { get; set; }

SVSim.Database/Models/ArenaTwoPickReward.cs

@@ -31,7 +31,7 @@ public class ArenaTwoPickReward
     public int Weight { get; set; } = 1;
 
     /// <summary><see cref="UserGoodsType"/> on the wire (e.g. Item=4, Rupy=9).</summary>
-    public int RewardType { get; set; }
+    public UserGoodsType RewardType { get; set; }
 
     /// <summary>Item id for Item; 0 for currencies.</summary>
     public long RewardId { get; set; }

SVSim.Database/Models/BattlePassMonthlyMissionEntry.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel.DataAnnotations.Schema;
 using SVSim.Database.Common;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -20,7 +21,7 @@ public class BattlePassMonthlyMissionEntry : BaseEntity<int>
     public string Name { get; set; } = "";
     public int RequireNumber { get; set; }
     public int BattlePassPoint { get; set; }
-    public int? RewardType { get; set; }
+    public UserGoodsType? RewardType { get; set; }
     public long? RewardDetailId { get; set; }
     public int? RewardNumber { get; set; }
     public string? EventType { get; set; }

SVSim.Database/Models/BattlePassRewardEntry.cs

@@ -13,7 +13,7 @@ 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 UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
     public bool IsAppealExclusion { get; set; }

SVSim.Database/Models/BuildDeckProductRewardEntry.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -11,7 +12,7 @@ namespace SVSim.Database.Models;
 public class BuildDeckProductRewardEntry
 {
     public int RewardIndex { get; set; }
-    public int RewardType { get; set; }   // Wizard.UserGoods.Type
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
     public int MessageId { get; set; }

SVSim.Database/Models/BuildDeckSeriesRewardEntry.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -13,7 +14,7 @@ public class BuildDeckSeriesRewardEntry
 {
     public int TierIndex { get; set; }   // 1, 2, 3, ... — unlock threshold
     public int ItemIndex { get; set; }   // ordinal within tier
-    public int RewardType { get; set; }
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
     public int MessageId { get; set; }

SVSim.Database/Models/LeaderSkinShopProductRewardEntry.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -11,7 +12,7 @@ namespace SVSim.Database.Models;
 public class LeaderSkinShopProductRewardEntry
 {
     public int OrderIndex { get; set; }
-    public int RewardType { get; set; }   // Wizard.UserGoods.Type
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
 }

SVSim.Database/Models/LeaderSkinShopSeriesRewardEntry.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -12,7 +13,7 @@ namespace SVSim.Database.Models;
 public class LeaderSkinShopSeriesRewardEntry
 {
     public int OrderIndex { get; set; }
-    public int RewardType { get; set; }
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
 }

SVSim.Database/Models/MissionCatalogEntry.cs

@@ -1,4 +1,5 @@
 using SVSim.Database.Common;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -14,7 +15,7 @@ public class MissionCatalogEntry : BaseEntity<int>
     public string Name { get; set; } = "";
     public int LotType { get; set; }
     public int RequireNumber { get; set; }
-    public int RewardType { get; set; }
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
     public int BattlePassPoint { get; set; }

SVSim.Database/Models/PuzzleMissionEntry.cs

@@ -1,4 +1,5 @@
 using SVSim.Database.Common;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -21,7 +22,7 @@ public class PuzzleMissionEntry : BaseEntity<int>
     public int OrderId { get; set; }
 
     // Reward (single-entry per mission)
-    public int RewardType { get; set; }      // UserGoodsType
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
 

SVSim.Database/Models/SleeveShopProductRewardEntry.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using SVSim.Database.Enums;
 
 namespace SVSim.Database.Models;
 
@@ -11,7 +12,7 @@ namespace SVSim.Database.Models;
 public class SleeveShopProductRewardEntry
 {
     public int OrderIndex { get; set; }
-    public int RewardType { get; set; }   // Wizard.UserGoods.Type
+    public UserGoodsType RewardType { get; set; }
     public long RewardDetailId { get; set; }
     public int RewardNumber { get; set; }
 }