feat(emblem): /emblem/emblem_list returns owned ids

SVSim.EmulatedEntrypoint/Controllers/EmblemController.cs

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+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Emblem;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /emblem/* — viewer-scoped emblem (lobby/profile badge) management. Read, mark-favorite,
+/// set-currently-displayed. Mirrors /sleeve/* and /degree/*.
+/// </summary>
+[Route("emblem")]
+public class EmblemController : SVSimController
+{
+    private readonly SVSimDbContext _db;
+
+    public EmblemController(SVSimDbContext db) => _db = db;
+
+    [HttpPost("emblem_list")]
+    public async Task<ActionResult<EmblemListResponse>> EmblemList(BaseRequest _, CancellationToken ct)
+    {
+        if (!TryGetViewerId(out long viewerId)) return Unauthorized();
+
+        var viewer = await _db.Viewers
+            .Include(v => v.Emblems)
+            .FirstOrDefaultAsync(v => v.Id == viewerId, ct);
+        if (viewer is null) return Unauthorized();
+
+        return new EmblemListResponse
+        {
+            UserEmblemList = viewer.Emblems
+                .Select(e => new EmblemListEntry { EmblemId = e.Id })
+                .OrderBy(x => x.EmblemId)
+                .ToList(),
+        };
+    }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Emblem/EmblemListEntry.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Emblem;
+
+[MessagePackObject]
+public class EmblemListEntry
+{
+    [JsonPropertyName("emblem_id")]
+    [Key("emblem_id")]
+    public int EmblemId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Emblem/EmblemListResponse.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Emblem;
+
+[MessagePackObject]
+public class EmblemListResponse
+{
+    [JsonPropertyName("user_emblem_list")]
+    [Key("user_emblem_list")]
+    public List<EmblemListEntry> UserEmblemList { get; set; } = new();
+}

SVSim.UnitTests/Controllers/EmblemControllerListTests.cs

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+using System.Net;
+using System.Text;
+using System.Text.Json;
+using NUnit.Framework;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using SVSim.Database;
+using SVSim.Database.Models;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+public class EmblemControllerListTests
+{
+    [Test]
+    public async Task EmblemList_returns_owned_ids_wrapped()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync(tutorialState: 0);
+
+        using (var scope = factory.Services.CreateScope())
+        {
+            var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+            var viewer = await db.Viewers.Include(v => v.Emblems).FirstAsync(v => v.Id == viewerId);
+            var e100 = await db.Set<EmblemEntry>().FirstOrDefaultAsync(e => e.Id == 100)
+                       ?? db.Set<EmblemEntry>().Add(new EmblemEntry { Id = 100 }).Entity;
+            var e101 = await db.Set<EmblemEntry>().FirstOrDefaultAsync(e => e.Id == 101)
+                       ?? db.Set<EmblemEntry>().Add(new EmblemEntry { Id = 101 }).Entity;
+            viewer.Emblems.Add(e100);
+            viewer.Emblems.Add(e101);
+            await db.SaveChangesAsync();
+        }
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        var requestJson = """{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var response = await client.PostAsync("/emblem/emblem_list",
+            new StringContent(requestJson, Encoding.UTF8, "application/json"));
+
+        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
+
+        var body = await response.Content.ReadAsStringAsync();
+        using var doc = JsonDocument.Parse(body);
+        var ids = doc.RootElement.GetProperty("user_emblem_list").EnumerateArray()
+            .Select(e => e.GetProperty("emblem_id").GetInt32())
+            .ToList();
+        Assert.That(ids, Does.Contain(100));
+        Assert.That(ids, Does.Contain(101));
+    }
+}