Add lesson marks 2-5 from lesson quality once per slot.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.AppHost.Tests/LessonMarkApiTests.cs

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+using System.Net;
+using System.Net.Http.Json;
+
+namespace HSchool.AppHost.Tests;
+
+[Collection(AppHostCollection.Name)]
+public class LessonMarkApiTests(AppHostFixture fixture)
+{
+    private static readonly DateTime Start = new(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);
+
+    [Fact]
+    public async Task PostMark_IsNotAccepted()
+    {
+        using var client = fixture.App.CreateHttpClient("server");
+        await SchoolApiTests.ResetAsync(client);
+        var school = await SchoolApiTests.CreateAsync(client, "Оценка API", Start, seed: 73);
+        var page = await client.GetFromJsonAsync<PeoplePage>(
+            $"/api/schools/{school.Id}/people?role=student&pageSize=1",
+            TestContext.Current.CancellationToken);
+        Assert.NotNull(page);
+        Assert.NotEmpty(page.People);
+        var personId = page.People[0].Id;
+
+        using var response = await client.PostAsJsonAsync(
+            $"/api/schools/{school.Id}/people/{personId}/marks",
+            new { subject = "Mathematics", value = 5, period = 1 },
+            TestContext.Current.CancellationToken);
+
+        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+
+        using var put = await client.PutAsJsonAsync(
+            $"/api/schools/{school.Id}/people/{personId}/marks",
+            new { subject = "Mathematics", value = 5, period = 1 },
+            TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.NotFound, put.StatusCode);
+    }
+
+    private sealed record PeoplePage(IReadOnlyList<PersonRow> People);
+
+    private sealed record PersonRow(string Id);
+}