feat(profile): ProfileController + DTOs + integration tests

Add /profile/index endpoint that returns user_rank_match_total_win (stubbed 0)
and user_class_list built from viewer Classes + owned LeaderSkins. Six NUnit
integration tests cover zero wins, all classes present, level/exp/default skin,
leader_skin_id_list population, is_random_leader_skin round-trip, and 401 on
unauthenticated access.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Controllers/ProfileController.cs

@@ -0,0 +1,51 @@
+using Microsoft.AspNetCore.Mvc;
+using SVSim.Database.Repositories.Viewer;
+using SVSim.EmulatedEntrypoint.Constants;
+using SVSim.EmulatedEntrypoint.Models.Dtos;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Profile;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /profile/* — viewer-scoped profile read endpoint. Surfaces total rank-match wins
+/// and the per-class roster (level, exp, leader-skin selection).
+/// </summary>
+[Route("profile")]
+public sealed class ProfileController : SVSimController
+{
+    private readonly IViewerRepository _viewerRepository;
+
+    public ProfileController(IViewerRepository viewerRepository) =>
+        _viewerRepository = viewerRepository;
+
+    [HttpPost("index")]
+    public async Task<ActionResult<ProfileIndexResponse>> Index(
+        [FromBody] ProfileIndexRequest _,
+        CancellationToken ct)
+    {
+        var shortUdidClaim = User.Claims.FirstOrDefault(c => c.Type == ShadowverseClaimTypes.ShortUdidClaim)?.Value;
+        if (shortUdidClaim is null || !long.TryParse(shortUdidClaim, out long shortUdid))
+            return Unauthorized();
+
+        var viewer = await _viewerRepository.GetViewerByShortUdid(shortUdid);
+        if (viewer is null) return NotFound();
+
+        var skinsByClass = viewer.LeaderSkins
+            .Where(s => s.ClassId.HasValue)
+            .GroupBy(s => s.ClassId!.Value)
+            .ToDictionary(g => g.Key, g => (IReadOnlyCollection<int>)g.Select(s => s.Id).ToList());
+
+        var classes = viewer.Classes
+            .Select(vc => new UserClass(
+                vc,
+                skinsByClass.GetValueOrDefault(vc.Class.Id, Array.Empty<int>())))
+            .ToList();
+
+        return new ProfileIndexResponse
+        {
+            // TODO: when rank-match results are tracked, compute from viewer's rank history.
+            UserRankMatchTotalWin = 0,
+            UserClassList = classes,
+        };
+    }
+}