feat(sleeve): shop catalog + /sleeve/{info,buy} endpoints

Schema: SleeveShopSeries -> SleeveShopProducts -> Rewards (owned).
Migration AddSleeveShop creates 3 tables with FK cascade.

Importer mirrors BuildDeck pattern: find-or-create per series/product,
rewards replaced wholesale on rerun (owned collection). 10 series,
270 products imported from seeds/sleeve-shop.json.

Controller:
- /sleeve/info returns wire-faithful dict-keyed shape
  ({sleeve_list: {<series_id>: {product_info: {<product_id>: ...}}}}).
  is_purchased_product derived from viewer.Sleeves.Contains(sleeve_id).
- /sleeve/buy: sales_type 0=free / 1=crystal / 2=rupy / 3=ticket(501).
  Validates series_product mismatch, currency, already-purchased.
  Currency debited with post-state-total reward_list entry; cosmetic
  grants dispatched through RewardGrantService.ApplyAsync (covers
  sleeve + emblem bundled grants per product).

476 tests pass (was 466; +10 sleeve tests).

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

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Sleeve/SleeveBuyRequest.cs

@@ -0,0 +1,25 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Sleeve;
+
+/// <summary>
+/// /sleeve/buy request body. sales_type is ShopCommonUtility.SalesType:
+/// 0=free, 1=crystal, 2=rupy, 3=ticket (v1: 3 returns 501, no ticket-priced sleeve captured).
+/// </summary>
+[MessagePackObject]
+public class SleeveBuyRequest : BaseRequest
+{
+    [JsonPropertyName("series_id")]
+    [Key("series_id")]
+    public int SeriesId { get; set; }
+
+    [JsonPropertyName("product_id")]
+    [Key("product_id")]
+    public int ProductId { get; set; }
+
+    [JsonPropertyName("sales_type")]
+    [Key("sales_type")]
+    public int SalesType { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Sleeve/SleeveBuyResponse.cs

@@ -0,0 +1,19 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Sleeve;
+
+/// <summary>
+/// /sleeve/buy response. <c>reward_list</c> items use reward_id/reward_num
+/// (POST-STATE-TOTAL for currencies, grant id+count for cosmetics) — driven by
+/// <c>PlayerStaticData.UpdateHaveUserGoodsNumByJsonData</c>. Mirrors the /pack/open +
+/// /build_deck/buy reward_list semantics.
+/// </summary>
+[MessagePackObject]
+public class SleeveBuyResponse
+{
+    [JsonPropertyName("reward_list")]
+    [Key("reward_list")]
+    public List<RewardListEntry> RewardList { get; set; } = new();
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Sleeve/SleeveInfoResponse.cs

@@ -0,0 +1,84 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Sleeve;
+
+/// <summary>
+/// /sleeve/info response. Wire shape: <c>{sleeve_list: {<series_id_str>: SleeveSeriesDto}}</c>.
+/// Dict-keyed (not array) to match the prod capture exactly — LitJson's numeric indexer in
+/// <c>SleevePurchaseInfoTask.Parse()</c> iterates dict values by inserted order, so either
+/// shape would work, but mirroring the wire avoids surprise.
+/// </summary>
+[MessagePackObject]
+public class SleeveInfoResponse
+{
+    [JsonPropertyName("sleeve_list")]
+    [Key("sleeve_list")]
+    public Dictionary<string, SleeveSeriesDto> SleeveList { get; set; } = new();
+}
+
+[MessagePackObject]
+public class SleeveSeriesDto
+{
+    [JsonPropertyName("series_id")]
+    [Key("series_id")]
+    public int SeriesId { get; set; }
+
+    [JsonPropertyName("is_new")]
+    [Key("is_new")]
+    public bool IsNew { get; set; }
+
+    /// <summary>Dict keyed by product_id string — same iteration convention as sleeve_list.</summary>
+    [JsonPropertyName("product_info")]
+    [Key("product_info")]
+    public Dictionary<string, SleeveProductDto> ProductInfo { get; set; } = new();
+}
+
+[MessagePackObject]
+public class SleeveProductDto
+{
+    [JsonPropertyName("product_id")]
+    [Key("product_id")]
+    public int ProductId { get; set; }
+
+    /// <summary>SystemText key (e.g. "sleeve_138") — client resolves via GetSleeveProductText.</summary>
+    [JsonPropertyName("name")]
+    [Key("name")]
+    public string Name { get; set; } = string.Empty;
+
+    [JsonPropertyName("rewards")]
+    [Key("rewards")]
+    public List<SleeveProductRewardDto> Rewards { get; set; } = new();
+
+    [JsonPropertyName("sales_period_info")]
+    [Key("sales_period_info")]
+    public List<object> SalesPeriodInfo { get; set; } = new();   // always [] in v1
+
+    [JsonPropertyName("is_purchased_product")]
+    [Key("is_purchased_product")]
+    public bool IsPurchasedProduct { get; set; }
+
+    [JsonPropertyName("price_crystal")]
+    [Key("price_crystal")]
+    public int? PriceCrystal { get; set; }
+
+    [JsonPropertyName("price_rupy")]
+    [Key("price_rupy")]
+    public int? PriceRupy { get; set; }
+}
+
+[MessagePackObject]
+public class SleeveProductRewardDto
+{
+    [JsonPropertyName("reward_type")]
+    [Key("reward_type")]
+    public int RewardType { get; set; }
+
+    [JsonPropertyName("reward_detail_id")]
+    [Key("reward_detail_id")]
+    public long RewardDetailId { get; set; }
+
+    [JsonPropertyName("reward_number")]
+    [Key("reward_number")]
+    public int RewardNumber { get; set; }
+}