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.EmulatedEntrypoint/Services/ArenaTwoPickService.cs

@@ -301,7 +301,7 @@ public class ArenaTwoPickService : IArenaTwoPickService
         // Pre-load item_type for any Item-typed reward so we can populate it on the
         // per-grant delta entries. Currencies don't need a lookup (item_type stays 0).
         var itemRewardIds = rewardRows
-            .Where(r => r.RewardType == (int)UserGoodsType.Item)
+            .Where(r => r.RewardType == UserGoodsType.Item)
             .Select(r => (int)r.RewardId)
             .Distinct()
             .ToList();
@@ -325,10 +325,10 @@ public class ArenaTwoPickService : IArenaTwoPickService
             // Skip when the rolled outcome is "nothing" (RewardNum == 0).
             if (pick.RewardNum <= 0) continue;
 
-            await tx.GrantAsync((UserGoodsType)pick.RewardType, pick.RewardId, pick.RewardNum);
+            await tx.GrantAsync(pick.RewardType, pick.RewardId, pick.RewardNum);
             deltas.Add(new TwoPickRewardReceivedDto
             {
-                RewardType     = pick.RewardType,
+                RewardType     = (int)pick.RewardType,
                 RewardDetailId = pick.RewardId,
                 RewardCount    = pick.RewardNum,
                 ItemType       = itemTypeById.TryGetValue((int)pick.RewardId, out var t) ? t : 0,
@@ -339,7 +339,7 @@ public class ArenaTwoPickService : IArenaTwoPickService
         var result = await tx.CommitAsync();
 
         var postStates = result.RewardList
-            .Select(g => new RewardEntryDto { RewardType = g.RewardType, RewardId = g.RewardId, RewardNum = g.RewardNum })
+            .Select(g => new RewardEntryDto { RewardType = (int)g.RewardType, RewardId = g.RewardId, RewardNum = g.RewardNum })
             .ToList();
 
         await _runs.DeleteAsync(viewerId);

SVSim.EmulatedEntrypoint/Services/BattlePassService.cs

@@ -184,7 +184,7 @@ public sealed class BattlePassService : IBattlePassService
         {
             if (claimSet.Contains((r.Track, r.Level))) continue;
             _viewerBp.AddClaim(viewerId, season.Id, r.Track, r.Level, now);
-            await tx.GrantAsync((UserGoodsType)r.RewardType, r.RewardDetailId, r.RewardNumber, ct);
+            await tx.GrantAsync(r.RewardType, r.RewardDetailId, r.RewardNumber, ct);
         }
 
         // CommitAsync handles DB save + currency-collision rule. Crystal spend is the first
@@ -240,7 +240,7 @@ public sealed class BattlePassService : IBattlePassService
                     if (r.Track == BattlePassTrack.Premium && !progress.IsPremium) continue;
                     if (claimSet.Contains((r.Track, r.Level))) continue;
                     _viewerBp.AddClaim(viewerId, season.Id, r.Track, r.Level, now);
-                    await tx.GrantAsync((UserGoodsType)r.RewardType, r.RewardDetailId, r.RewardNumber, ct);
+                    await tx.GrantAsync(r.RewardType, r.RewardDetailId, r.RewardNumber, ct);
                 }
             }
 
@@ -297,7 +297,7 @@ public sealed class BattlePassService : IBattlePassService
         return new BattlePassRewardDto
         {
             RewardLevel = Inv(r.Level),
-            RewardType = Inv(r.RewardType),
+            RewardType = Inv((int)r.RewardType),
             RewardDetailId = Inv(r.RewardDetailId),
             RewardNumber = Inv(r.RewardNumber),
             IsReceived = claimSet.Contains((r.Track, r.Level)),

SVSim.EmulatedEntrypoint/Services/GachaPointService.cs

@@ -210,9 +210,7 @@ public sealed class GachaPointService : IGachaPointService
         // Emblem (standard legendary) or Skin+Emblem (leader). Convert at the wire boundary
         // so ExchangeOutcome still carries RewardListEntry for the controller response.
         var granted = await tx.GrantAsync(UserGoodsType.Card, cardId, 1);
-        var rewardList = granted
-            .Select(g => new RewardListEntry { RewardType = g.RewardType, RewardId = g.RewardId, RewardNum = g.RewardNum })
-            .ToList();
+        var rewardList = granted.ToRewardList();
 
         return ExchangeOutcome.Ok(rewardList);
     }

SVSim.EmulatedEntrypoint/Services/MissionAssembler.cs

@@ -92,7 +92,7 @@ public sealed class MissionAssembler : IMissionAssembler
                 LotType = cat.LotType.ToString(),
                 BattlePassPoint = cat.BattlePassPoint.ToString(),
                 RequireNumber = cat.RequireNumber,
-                RewardType = cat.RewardType,
+                RewardType = (int)cat.RewardType,
                 RewardDetailId = cat.RewardDetailId,
                 RewardNumber = cat.RewardNumber,
                 DefaultFlag = cat.DefaultFlag,
@@ -117,7 +117,7 @@ public sealed class MissionAssembler : IMissionAssembler
                 TotalCount = total,
                 AchievementName = catalog.Name,
                 RequireNumber = catalog.RequireNumber,
-                RewardType = catalog.RewardType,
+                RewardType = (int)catalog.RewardType,
                 RewardDetailId = catalog.RewardDetailId,
                 RewardNumber = catalog.RewardNumber,
                 MaxLevel = maxLevel,
@@ -164,7 +164,7 @@ public sealed class MissionAssembler : IMissionAssembler
                     {
                         entry.RewardInfo = new BPMonthlyMissionRewardInfoDto
                         {
-                            RewardType = mm.RewardType.Value.ToString(),
+                            RewardType = ((int)mm.RewardType.Value).ToString(),
                             RewardDetailId = (mm.RewardDetailId ?? 0).ToString(),
                             RewardNumber = (mm.RewardNumber ?? 0).ToString(),
                         };

SVSim.EmulatedEntrypoint/Services/StoryService.cs

@@ -150,7 +150,7 @@ public class StoryService : IStoryService
                 }).ToList(),
                 StoryReward = c.Rewards.Select(r => new RewardDto
                 {
-                    RewardType = r.RewardType.ToString(),
+                    RewardType = ((int)r.RewardType).ToString(),
                     RewardDetailId = r.RewardDetailId.ToString(),
                     RewardNumber = r.RewardNumber.ToString(),
                 }).ToList(),
@@ -539,7 +539,7 @@ public class StoryService : IStoryService
                 {
                     try
                     {
-                        await tx.GrantAsync((UserGoodsType)r.RewardType, r.RewardDetailId, r.RewardNumber);
+                        await tx.GrantAsync(r.RewardType, r.RewardDetailId, r.RewardNumber);
                     }
                     catch (NotSupportedException ex)
                     {
@@ -564,7 +564,7 @@ public class StoryService : IStoryService
                 {
                     resp.RewardList.Add(new RewardGrant
                     {
-                        RewardType = g.RewardType.ToString(),
+                        RewardType = ((int)g.RewardType).ToString(),
                         RewardId = g.RewardId.ToString(),
                         RewardNum = g.RewardNum.ToString(),
                     });