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/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)),