feat: добавил отправку уведомлений по почте

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

@@ -152,6 +152,12 @@ public class EndpointAuthorizationTests : IClassFixture<ApiWebApplicationFactory
         yield return E("sync/status GET [Admin]",          "GET",    "api/v1/sync/status",    "Admin",   forbidden: ["Student", "Teacher"]);
         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 — 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"}""");
+        yield return E("notifications/schedule POST [Admin]", "POST", "api/v1/notifications/schedule", "Admin", forbidden: ["Student", "Teacher"],
+            body: $$"""{"channel":"email","recipient":"user@test.com","subject":"Test","body":"Hello","sendAt":"{{DateTimeOffset.UtcNow.AddMinutes(5):O}}"}""");
     }
 
     /// <summary>