feat: добавил личные уведомления для пользователей

Реализовал хранение, получение и отметку прочитанными пользовательских уведомлений. Обновил фронтенд для отображения и управления уведомлениями в профиле студента.

backend/UniVerse.Api.Tests/Authorization/EndpointAuthorizationTests.cs

@@ -153,6 +153,10 @@ public class EndpointAuthorizationTests : IClassFixture<ApiWebApplicationFactory
         yield return E("sync/rooms POST [Admin]",          "POST",   "api/v1/sync/rooms",     "Admin",   forbidden: ["Student", "Teacher"]);
         yield return E("sync/employees POST [Admin]",      "POST",   "api/v1/sync/employees?fullname=test","Admin",forbidden: ["Student", "Teacher"]);
 
+        // ── Notifications — any auth ───────────────────────────────────────────
+        yield return E("notifications GET [AnyAuth]", "GET", "api/v1/notifications", "Student");
+        yield return E("notifications/read-all PATCH [AnyAuth]", "PATCH", "api/v1/notifications/read-all", "Student");
+
         // ── Notifications — Admin only ─────────────────────────────────────────
         yield return E("notifications/send POST [Admin]",  "POST",   "api/v1/notifications/send", "Admin", forbidden: ["Student", "Teacher"],
             body: """{"channel":"email","recipient":"user@test.com","subject":"Test","body":"Hello"}""");

backend/UniVerse.Api.Tests/Gamification/GamificationServiceTests.cs

@@ -1,6 +1,9 @@
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging.Abstractions;
+using NSubstitute;
+using UniVerse.Application.DTOs.Notifications;
+using UniVerse.Application.Interfaces;
 using UniVerse.Domain.Entities;
 using UniVerse.Domain.Enums;
 using UniVerse.Infrastructure.Data;
@@ -105,6 +108,17 @@ public class GamificationServiceTests
 
     private static GamificationService CreateService(AppDbContext db)
     {
+        var notifications = Substitute.For<INotificationService>();
+        notifications.CreateUserNotificationAsync(
+                Arg.Any<int>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<CancellationToken>())
+            .Returns(callInfo => new UserNotificationDto(1, callInfo.ArgAt<string>(1), callInfo.ArgAt<string>(2), callInfo.ArgAt<string>(3), false, DateTime.UtcNow));
+        notifications.SendAsync(Arg.Any<NotificationMessage>(), Arg.Any<CancellationToken>())
+            .Returns(Task.CompletedTask);
+
         var configuration = new ConfigurationBuilder()
             .AddInMemoryCollection(new Dictionary<string, string?>
             {
@@ -114,7 +128,7 @@ public class GamificationServiceTests
             })
             .Build();
 
-        return new GamificationService(db, configuration, NullLogger<GamificationService>.Instance);
+        return new GamificationService(db, configuration, notifications, NullLogger<GamificationService>.Instance);
     }
 
     private static Achievement Achievement(int id, string name, string condition, int coinReward) => new()

backend/UniVerse.Api.Tests/Helpers/ApiWebApplicationFactory.cs

@@ -134,6 +134,17 @@ public class ApiWebApplicationFactory : WebApplicationFactory<Program>
             .Returns(Task.CompletedTask);
         stub.ScheduleAsync(Arg.Any<ScheduleNotificationRequest>(), Arg.Any<CancellationToken>())
             .Returns(new ScheduledNotificationResponse("test-job", DateTimeOffset.UtcNow.AddMinutes(5)));
+        stub.GetUserNotificationsAsync(Arg.Any<int>(), Arg.Any<PaginationRequest>(), Arg.Any<CancellationToken>())
+            .Returns(PagedResult<UserNotificationDto>.Create([], 0, 1, 20));
+        stub.MarkAllReadAsync(Arg.Any<int>(), Arg.Any<CancellationToken>())
+            .Returns(Task.CompletedTask);
+        stub.CreateUserNotificationAsync(
+                Arg.Any<int>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<CancellationToken>())
+            .Returns(new UserNotificationDto(1, "achievement", "Title", "Body", false, DateTime.UtcNow));
         return stub;
     }