refactor(inventory): move GrantedReward + EffectiveCosmetics into Inventory namespace folder

Both types stay in namespace SVSim.Database.Services so existing using directives
in controllers, services, and tests resolve without change. Their definitions are
extracted to SVSim.Database/Services/Inventory/InventoryGrantTypes.cs; the empty
husks in RewardGrantService.cs and IViewerEntitlements.cs will be deleted in the
next commit.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.Database/Services/IViewerEntitlements.cs

@@ -40,15 +40,3 @@ public interface IViewerEntitlements
     Task<EffectiveCosmetics> EffectiveCosmeticsAsync(Viewer viewer, CancellationToken ct = default);
 }
 
-/// <summary>
-/// Cosmetic projection bundle for /load/index. The four id-lists are "what the viewer owns"
-/// (all of them in freeplay). Leader skins are always the full catalog with a per-skin owned flag;
-/// <see cref="OwnedLeaderSkinIds"/> is every skin id in freeplay.
-/// </summary>
-public sealed record EffectiveCosmetics(
-    IReadOnlyList<int> SleeveIds,
-    IReadOnlyList<int> EmblemIds,
-    IReadOnlyList<int> DegreeIds,
-    IReadOnlyList<int> MyPageBackgroundIds,
-    IReadOnlyList<LeaderSkinEntry> AllLeaderSkins,
-    IReadOnlySet<int> OwnedLeaderSkinIds);

SVSim.Database/Services/Inventory/InventoryGrantTypes.cs

@@ -0,0 +1,27 @@
+using SVSim.Database.Enums;
+using SVSim.Database.Models;
+
+namespace SVSim.Database.Services;
+
+/// <summary>
+/// Wire-shape entry returned by <see cref="Inventory.IInventoryTransaction.GrantAsync"/> and
+/// collected in <see cref="Inventory.InventoryCommitResult.RewardList"/> /
+/// <see cref="Inventory.InventoryCommitResult.Deltas"/>. Field names match the
+/// <c>reward_list</c> entries used by <c>/pack/open</c>, <c>/basic_puzzle/finish</c>, and
+/// <c>/story/*/finish</c>. reward_num is a POST-STATE TOTAL for currencies and a count for
+/// collection grants — see <see cref="Models.RewardListEntry"/>.
+/// </summary>
+public sealed record GrantedReward(int RewardType, long RewardId, int RewardNum);
+
+/// <summary>
+/// Cosmetic projection bundle for /load/index. The four id-lists are "what the viewer owns"
+/// (all of them in freeplay). Leader skins are always the full catalog with a per-skin owned flag;
+/// <see cref="OwnedLeaderSkinIds"/> is every skin id in freeplay.
+/// </summary>
+public sealed record EffectiveCosmetics(
+    IReadOnlyList<int> SleeveIds,
+    IReadOnlyList<int> EmblemIds,
+    IReadOnlyList<int> DegreeIds,
+    IReadOnlyList<int> MyPageBackgroundIds,
+    IReadOnlyList<LeaderSkinEntry> AllLeaderSkins,
+    IReadOnlySet<int> OwnedLeaderSkinIds);

SVSim.Database/Services/RewardGrantService.cs

@@ -5,14 +5,6 @@ using SVSim.Database.Models;
 
 namespace SVSim.Database.Services;
 
-/// <summary>
-/// Wire-shape entry returned by <see cref="RewardGrantService.ApplyAsync"/>. Field names match
-/// the <c>reward_list</c> entries used by <c>/pack/open</c>, <c>/basic_puzzle/finish</c>, and
-/// <c>/story/*/finish</c>. reward_num is a POST-STATE TOTAL for currencies and a count for
-/// collection grants — see <see cref="Models.RewardListEntry"/>.
-/// </summary>
-public sealed record GrantedReward(int RewardType, long RewardId, int RewardNum);
-
 /// <summary>
 /// Single canonical grant primitive for every <see cref="UserGoodsType"/> the server hands to a
 /// viewer. Switch on the type, mutate the appropriate viewer collection / <see cref="ViewerCurrency"/>