feat(mypage): /mypage/finish_battle (returns check=0 — no in-flight state yet)

SVSim.EmulatedEntrypoint/Controllers/MyPageController.cs

@@ -10,7 +10,9 @@ using SVSim.EmulatedEntrypoint.Constants;
 using SVSim.EmulatedEntrypoint.Infrastructure;
 using SVSim.EmulatedEntrypoint.Models.Dtos;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.MyPage;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.MyPage;
 using SVSim.EmulatedEntrypoint.Services;
 
 namespace SVSim.EmulatedEntrypoint.Controllers;
@@ -361,4 +363,11 @@ public class MyPageController : SVSimController
             EndTime = row.EndTime.ToString(WireDateFormat, CultureInfo.InvariantCulture),
         };
     }
+
+    [HttpPost("finish_battle")]
+    public ActionResult<MyPageFinishBattleResponse> FinishBattle([FromBody] MyPageFinishBattleRequest _)
+    {
+        if (!TryGetViewerId(out long __)) return Unauthorized();
+        return new MyPageFinishBattleResponse { CheckUnfinishedBattle = 0 };
+    }
 }

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/MyPage/MyPageFinishBattleRequest.cs

@@ -0,0 +1,14 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.MyPage;
+
+[MessagePackObject]
+public class MyPageFinishBattleRequest : BaseRequest
+{
+    // Wire key is uppercase "SDTRB" — verbatim from
+    // PlayerPrefsWrapper.SELF_DISCONNECT_OPEN_STATUS_TO_REPLACE_LOG.
+    [JsonPropertyName("SDTRB")]
+    [Key("SDTRB")]
+    public int Sdtrb { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/MyPage/MyPageFinishBattleResponse.cs

@@ -0,0 +1,17 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.MyPage;
+
+/// <summary>
+/// Spec source: docs/api-spec/endpoints/post-login/mypage-finish-battle.md.
+/// We always emit check_unfinished_battle=0 because no in-flight battle state
+/// is tracked server-side yet. When that lands, branch to is_win + class/rank refresh.
+/// </summary>
+[MessagePackObject]
+public class MyPageFinishBattleResponse
+{
+    [JsonPropertyName("check_unfinished_battle")]
+    [Key("check_unfinished_battle")]
+    public int CheckUnfinishedBattle { get; set; }
+}

SVSim.UnitTests/Controllers/MyPageControllerFinishBattleTests.cs

@@ -0,0 +1,28 @@
+using System.Net;
+using System.Text;
+using System.Text.Json;
+using NUnit.Framework;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+public class MyPageControllerFinishBattleTests
+{
+    [Test]
+    public async Task FinishBattle_returns_check_zero()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync(tutorialState: 0);
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+
+        var requestJson = """{"SDTRB":0,"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var response = await client.PostAsync("/mypage/finish_battle",
+            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);
+        Assert.That(doc.RootElement.GetProperty("check_unfinished_battle").GetInt32(), Is.EqualTo(0));
+    }
+}