feat(leader-skin): shop catalog + 5 endpoints (/products, /buy, /buy_set, /buy_set_item, /ids)

Schema: LeaderSkinShopSeries -> Products (owned rewards) + owned
SetCompletionRewards on the series; ViewerLeaderSkinSetClaim composite
PK (ViewerId, SeriesId) backs the /buy_set_item idempotent-claim check.

Importer mirrors SleeveShopImporter: idempotent find-or-create, owned
collections rewritten wholesale on rerun. 16 series, 104 products.

Controller (extends existing /set with 5 new endpoints):
- /products: dict-keyed-by-series_id-string wire shape. is_completed
  per-viewer, rewards.status from ViewerLeaderSkinSetClaim (0=no set
  sale, 1=available, 2=claimed) matching client RewardStatus enum.
- /buy: single skin, sales_type 1/2 dispatch, 3=>501.
- /buy_set: whole series at SetPrice; requires set_sales_status != 0;
  grants every product's rewards (RewardGrantService idempotent on
  already-owned cosmetics, so partial-set buys don't double-add).
- /buy_set_item: requires viewer owns every skin in series; idempotent
  on re-claim (returns 200 + empty reward_list, not 400) so client
  retries don't error.
- /ids: flat owned-skin-id list for badge refresh.

496 tests pass (was 486; +10 leader-skin-shop tests).

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

SVSim.Bootstrap/Importers/LeaderSkinShopImporter.cs

@@ -0,0 +1,115 @@
+using Microsoft.EntityFrameworkCore;
+using SVSim.Bootstrap.Models.Seed;
+using SVSim.Database;
+using SVSim.Database.Models;
+
+namespace SVSim.Bootstrap.Importers;
+
+/// <summary>
+/// Idempotent upsert of the leader-skin-shop catalog from <c>seeds/leader-skin-shop.json</c>.
+/// Mirror of <see cref="SleeveShopImporter"/>. Source is the wire
+/// <c>/leader_skin/products</c> response, extracted via
+/// <c>data_dumps/extract/extract-leader-skin-shop.py</c>. Rows missing from the seed are LEFT INTACT.
+/// </summary>
+public class LeaderSkinShopImporter
+{
+    public async Task<int> ImportAsync(SVSimDbContext context, string seedDir)
+    {
+        string path = Path.Combine(seedDir, "leader-skin-shop.json");
+        var seed = SeedLoader.LoadList<LeaderSkinShopSeriesSeed>(path);
+        if (seed.Count == 0)
+        {
+            Console.WriteLine("[LeaderSkinShopImporter] No seed rows; skipping.");
+            return 0;
+        }
+
+        var existingSeries = await context.LeaderSkinShopSeries
+            .Include(s => s.SetCompletionRewards)
+            .Include(s => s.Products).ThenInclude(p => p.Rewards)
+            .ToDictionaryAsync(s => s.Id);
+
+        int createdSeries = 0, updatedSeries = 0, createdProducts = 0, updatedProducts = 0;
+
+        foreach (var s in seed)
+        {
+            if (s.SeriesId == 0) continue;
+
+            if (!existingSeries.TryGetValue(s.SeriesId, out var series))
+            {
+                series = new LeaderSkinShopSeriesEntry { Id = s.SeriesId };
+                context.LeaderSkinShopSeries.Add(series);
+                existingSeries[s.SeriesId] = series;
+                createdSeries++;
+            }
+            else updatedSeries++;
+
+            series.IsNew = s.IsNew;
+            series.IsEnabled = true;
+            series.SetSalesStatus = s.SetSalesStatus;
+            series.SetPriceCrystal = s.SetPriceCrystal;
+            series.SetPriceRupy = s.SetPriceRupy;
+            series.SetPriceTicket = s.SetPriceTicket;
+            series.SetPriceTicketId = s.SetPriceTicketId;
+            // SetCompletionRewardStatus stays at the catalog default 0 — per-viewer claim state
+            // is computed at request time from ViewerLeaderSkinSetClaim, not from this column.
+            series.SetCompletionRewardStatus = 0;
+
+            // Replace owned collections wholesale on rerun.
+            series.SetCompletionRewards.Clear();
+            foreach (var r in s.SetCompletionRewards.OrderBy(r => r.OrderIndex))
+            {
+                series.SetCompletionRewards.Add(new LeaderSkinShopSeriesRewardEntry
+                {
+                    OrderIndex = r.OrderIndex,
+                    RewardType = r.RewardType,
+                    RewardDetailId = r.RewardDetailId,
+                    RewardNumber = r.RewardNumber,
+                });
+            }
+
+            var existingProducts = series.Products.ToDictionary(p => p.Id);
+            foreach (var p in s.Products)
+            {
+                if (p.ProductId == 0) continue;
+
+                if (!existingProducts.TryGetValue(p.ProductId, out var product))
+                {
+                    product = new LeaderSkinShopProductEntry { Id = p.ProductId };
+                    series.Products.Add(product);
+                    createdProducts++;
+                }
+                else updatedProducts++;
+
+                product.SeriesId = s.SeriesId;
+                product.LeaderSkinId = p.LeaderSkinId;
+                product.ProductNameKey = p.ProductNameKey;
+                product.IntroductionKey = p.IntroductionKey;
+                product.CvNameKey = p.CvNameKey;
+                product.SinglePriceCrystal = p.SinglePriceCrystal;
+                product.SinglePriceRupy = p.SinglePriceRupy;
+                product.SinglePriceTicket = p.SinglePriceTicket;
+                product.TicketNumber = p.TicketNumber;
+                product.TicketItemId = p.TicketItemId;
+                product.IsEnabled = true;
+
+                product.Rewards.Clear();
+                foreach (var r in p.Rewards.OrderBy(r => r.OrderIndex))
+                {
+                    product.Rewards.Add(new LeaderSkinShopProductRewardEntry
+                    {
+                        OrderIndex = r.OrderIndex,
+                        RewardType = r.RewardType,
+                        RewardDetailId = r.RewardDetailId,
+                        RewardNumber = r.RewardNumber,
+                    });
+                }
+            }
+        }
+
+        await context.SaveChangesAsync();
+        Console.WriteLine(
+            $"[LeaderSkinShopImporter] series +{createdSeries}/~{updatedSeries}, " +
+            $"products +{createdProducts}/~{updatedProducts}");
+        return createdSeries + updatedSeries;
+    }
+}

SVSim.Bootstrap/Models/Seed/LeaderSkinShopSeed.cs

@@ -0,0 +1,39 @@
+using System.Text.Json.Serialization;
+
+namespace SVSim.Bootstrap.Models.Seed;
+
+public sealed class LeaderSkinShopSeriesSeed
+{
+    [JsonPropertyName("series_id")] public int SeriesId { get; set; }
+    [JsonPropertyName("is_new")] public bool IsNew { get; set; }
+    [JsonPropertyName("set_sales_status")] public int SetSalesStatus { get; set; }
+    [JsonPropertyName("set_price_crystal")] public int? SetPriceCrystal { get; set; }
+    [JsonPropertyName("set_price_rupy")] public int? SetPriceRupy { get; set; }
+    [JsonPropertyName("set_price_ticket")] public int? SetPriceTicket { get; set; }
+    [JsonPropertyName("set_price_ticket_id")] public long? SetPriceTicketId { get; set; }
+    [JsonPropertyName("set_completion_rewards")] public List<LeaderSkinShopRewardSeed> SetCompletionRewards { get; set; } = new();
+    [JsonPropertyName("products")] public List<LeaderSkinShopProductSeed> Products { get; set; } = new();
+}
+
+public sealed class LeaderSkinShopProductSeed
+{
+    [JsonPropertyName("product_id")] public int ProductId { get; set; }
+    [JsonPropertyName("leader_skin_id")] public int LeaderSkinId { get; set; }
+    [JsonPropertyName("product_name_key")] public string ProductNameKey { get; set; } = "";
+    [JsonPropertyName("introduction_key")] public string IntroductionKey { get; set; } = "";
+    [JsonPropertyName("cv_name_key")] public string CvNameKey { get; set; } = "";
+    [JsonPropertyName("single_price_crystal")] public int? SinglePriceCrystal { get; set; }
+    [JsonPropertyName("single_price_rupy")] public int? SinglePriceRupy { get; set; }
+    [JsonPropertyName("single_price_ticket")] public int? SinglePriceTicket { get; set; }
+    [JsonPropertyName("ticket_number")] public int? TicketNumber { get; set; }
+    [JsonPropertyName("ticket_item_id")] public long? TicketItemId { get; set; }
+    [JsonPropertyName("rewards")] public List<LeaderSkinShopRewardSeed> Rewards { get; set; } = new();
+}
+
+public sealed class LeaderSkinShopRewardSeed
+{
+    [JsonPropertyName("order_index")] public int OrderIndex { get; set; }
+    [JsonPropertyName("reward_type")] public int RewardType { get; set; }
+    [JsonPropertyName("reward_detail_id")] public long RewardDetailId { get; set; }
+    [JsonPropertyName("reward_number")] public int RewardNumber { get; set; }
+}

SVSim.Bootstrap/Program.cs

@@ -100,6 +100,7 @@ public static class Program
             await new ItemImporter().ImportAsync(context, opts.SeedDir);
             await new SleeveShopImporter().ImportAsync(context, opts.SeedDir);
             await new ItemPurchaseImporter().ImportAsync(context, opts.SeedDir);
+            await new LeaderSkinShopImporter().ImportAsync(context, opts.SeedDir);
             var puzzleImporter = new PuzzleImporter();
             await puzzleImporter.ImportGroupsAsync(context, opts.SeedDir);
             await puzzleImporter.ImportPuzzlesAsync(context, opts.SeedDir);