feat(mypage): can_give_daily_login_bonus reflects IsDue(viewer)

Injects ILoginBonusService into MyPageController and sets
CanGiveDailyLoginBonus from IsDue(viewer) in the Index response.
Adds two integration tests: fresh viewer → true, post-load-index → false.

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

SVSim.UnitTests/Controllers/MyPageControllerTests.cs

@@ -0,0 +1,57 @@
+using System.Net;
+using System.Text;
+using System.Text.Json;
+using NUnit.Framework;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+/// <summary>
+/// Coverage for <c>/mypage/index</c>. Focused on fields computed from viewer state
+/// that are easy to regress (can_give_daily_login_bonus).
+/// </summary>
+public class MyPageControllerTests
+{
+    // MyPageIndexRequest extends BaseRequest, so viewer_id + steam_session_ticket are required.
+    private const string MyPageRequestJson =
+        """{"viewer_id":"0","steam_id":0,"steam_session_ticket":"","carrier":"steam"}""";
+
+    private const string LoadIndexRequestJson =
+        """{"viewer_id":"0","steam_id":0,"steam_session_ticket":"","carrier":"steam","card_master_hash":""}""";
+
+    [Test]
+    public async Task MyPage_can_give_daily_login_bonus_is_true_for_fresh_viewer()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+
+        var resp = await client.PostAsync("/mypage/index",
+            new StringContent(MyPageRequestJson, Encoding.UTF8, "application/json"));
+        Assert.That(resp.StatusCode, Is.EqualTo(HttpStatusCode.OK), await resp.Content.ReadAsStringAsync());
+
+        var root = JsonDocument.Parse(await resp.Content.ReadAsStringAsync()).RootElement;
+        Assert.That(root.GetProperty("can_give_daily_login_bonus").GetBoolean(), Is.True);
+    }
+
+    [Test]
+    public async Task MyPage_can_give_daily_login_bonus_is_false_after_load_index_claim()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+
+        // /load/index claims today's bonus
+        var loadResp = await client.PostAsync("/load/index",
+            new StringContent(LoadIndexRequestJson, Encoding.UTF8, "application/json"));
+        Assert.That(loadResp.StatusCode, Is.EqualTo(HttpStatusCode.OK), await loadResp.Content.ReadAsStringAsync());
+
+        // /mypage/index must report flag = false after the claim
+        var resp = await client.PostAsync("/mypage/index",
+            new StringContent(MyPageRequestJson, Encoding.UTF8, "application/json"));
+        Assert.That(resp.StatusCode, Is.EqualTo(HttpStatusCode.OK), await resp.Content.ReadAsStringAsync());
+
+        var root = JsonDocument.Parse(await resp.Content.ReadAsStringAsync()).RootElement;
+        Assert.That(root.GetProperty("can_give_daily_login_bonus").GetBoolean(), Is.False);
+    }
+}