test: add GameSystem fuzzy matching and showcase query tests

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

tests/GmRelay.Bot.Tests/Web/AuthorizedSessionServiceTests.cs

@@ -2,6 +2,7 @@ using GmRelay.Web.Services;
 using System.Security.Claims;
 using Microsoft.AspNetCore.Http;
 using GmRelay.Shared.Domain;
+using GmRelay.Shared.Features.Showcase;
 
 namespace GmRelay.Bot.Tests.Web;
 
@@ -1209,6 +1210,15 @@ public sealed class AuthorizedSessionServiceTests
         public Task UpsertPlayerAsync(string platform, string externalUserId, string displayName, string? avatarUrl) =>
             Task.CompletedTask;
 
+        public Task<IReadOnlyList<ShowcaseSessionDto>> GetShowcaseSessionsAsync(ShowcaseFilter filter, int page, int pageSize) =>
+            Task.FromResult<IReadOnlyList<ShowcaseSessionDto>>([]);
+
+        public Task<ShowcaseSessionDto?> GetShowcaseSessionAsync(Guid sessionId) =>
+            Task.FromResult<ShowcaseSessionDto?>(null);
+
+        public Task<bool> RegisterFromShowcaseAsync(Guid sessionId, string platform, string externalUserId, string displayName) =>
+            Task.FromResult(false);
+
         private bool IsManager(Guid groupId, long telegramId) =>
             IsOwner(groupId, telegramId) ||
             managers.Any(manager => manager.GroupId == groupId && manager.TelegramId == telegramId);