feat(signup): seed tutorial gifts as ViewerPresent rows on /tool/signup

SVSim.Database/Repositories/Viewer/ViewerRepository.cs

@@ -3,6 +3,7 @@ using Npgsql;
 using SVSim.Database.Enums;
 using SVSim.Database.Models;
 using SVSim.Database.Models.Config;
+using SVSim.Database.SeedData;
 using SVSim.Database.Services;
 
 namespace SVSim.Database.Repositories.Viewer;
@@ -110,6 +111,29 @@ public class ViewerRepository : IViewerRepository
         var viewer = await BuildDefaultViewer("");
         viewer.Udid = udid;
         _dbContext.Set<Models.Viewer>().Add(viewer);
+
+        // Eager-seed the tutorial gifts so the inbox is populated by the time the tutorial
+        // walks the user to it (which happens AFTER initial battles, per the gift-inbox
+        // design). The unique (ViewerId, PresentId) index is the backstop against
+        // double-seeding on a retried signup. Both inserts commit in a single SaveChanges.
+        var createdAt = DateTime.UtcNow;
+        foreach (var spec in TutorialPresents.All)
+        {
+            _dbContext.Set<ViewerPresent>().Add(new ViewerPresent
+            {
+                Viewer         = viewer,        // EF wires up ViewerId via the nav after Insert
+                PresentId      = spec.PresentId,
+                Status         = PresentStatus.Unclaimed,
+                RewardType     = spec.RewardType,
+                RewardDetailId = spec.RewardDetailId,
+                RewardCount    = spec.RewardCount,
+                ItemType       = spec.ItemType,
+                Message        = spec.Message,
+                CreatedAt      = createdAt,
+                Source         = "tutorial",
+            });
+        }
+
         try
         {
             await _dbContext.SaveChangesAsync();