perf: Оптимизировал работу с Modeus API

Устранил искусственную задержку и принудительный сбор мусора в сервисе сотрудников, повысив его отзывчивость.

Перевел HTTP-запросы на использование `JsonContent.Create` и асинхронную десериализацию из потока, что значительно улучшило эффективность обработки JSON.

SfeduSchedule/Services/ModeusEmployeeService.cs

@@ -36,10 +36,6 @@ public class ModeusEmployeeService(ILogger<ModeusEmployeeService> logger, Modeus
                     _employees = employees;
                     logger.LogInformationHere($"Получено {employees.Count} сотрудников из Modeus.");
                 }
-
-                await Task.Delay(TimeSpan.FromSeconds(5), _cts.Token);
-                GC.Collect();
-                GC.WaitForPendingFinalizers();
             }
             catch (OperationCanceledException)
             {

SfeduSchedule/Services/ModeusHttpClient.cs

@@ -1,6 +1,6 @@
 using System.Diagnostics;
-using System.Text;
 using System.Text.Json;
+using System.Net.Http.Json;
 using Microsoft.Net.Http.Headers;
 using ModeusSchedule.Abstractions;
 using ModeusSchedule.Abstractions.DTO;
@@ -40,8 +40,7 @@ public class ModeusHttpClient
     {
         using var request = new HttpRequestMessage(HttpMethod.Post,
             $"schedule-calendar-v2/api/calendar/events/search?tz={_configuration["TZ"]!}");
-        request.Content = new StringContent(JsonSerializer.Serialize(msr, GlobalConsts.JsonSerializerOptions),
+        request.Content = JsonContent.Create(msr, options: GlobalConsts.JsonSerializerOptions);
-            Encoding.UTF8, "application/json");
         using var response = await _httpClient.SendAsync(request);
         if (response.StatusCode != System.Net.HttpStatusCode.OK)
         {
@@ -60,11 +59,13 @@ public class ModeusHttpClient
         {
             _logger.LogErrorHere($"Неуспешный статус при получении расписания: {response.StatusCode}, eventId: {eventId}");
         }
-        List<Attendees>? attendees;
         try
         {
-            attendees = Attendees.FromJson(await response.Content.ReadAsStringAsync());
+            await using var contentStream = await response.Content.ReadAsStreamAsync();
-            return attendees;
+            var attendees = await JsonSerializer.DeserializeAsync<List<Attendees>>(
+                contentStream,
+                GlobalConsts.JsonSerializerOptions);
+            return attendees ?? [];
         }
         catch (Exception ex)
         {
@@ -78,9 +79,7 @@ public class ModeusHttpClient
     {
         using var request = new HttpRequestMessage(HttpMethod.Post,
             $"schedule-calendar-v2/api/people/persons/search");
-        request.Content = new StringContent(
+        request.Content = JsonContent.Create(modeusSearchPersonRequest, options: GlobalConsts.JsonSerializerOptions);
-            JsonSerializer.Serialize(modeusSearchPersonRequest, GlobalConsts.JsonSerializerOptions),
-            Encoding.UTF8, "application/json");
         var stopwatch = Stopwatch.StartNew();
         using var response = await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
         var requestMs = stopwatch.ElapsedMilliseconds;
@@ -114,9 +113,7 @@ public class ModeusHttpClient
     public async Task<string?> SearchRoomsAsync(RoomSearchRequest requestDto)
     {
         using var request = new HttpRequestMessage(HttpMethod.Post, "schedule-calendar-v2/api/campus/rooms/search");
-        request.Content =
+        request.Content = JsonContent.Create(requestDto, options: GlobalConsts.JsonSerializerOptions);
-            new StringContent(JsonSerializer.Serialize(requestDto, GlobalConsts.JsonSerializerOptions),
-                Encoding.UTF8, "application/json");
         using var response = await _httpClient.SendAsync(request);
         if (response.StatusCode != System.Net.HttpStatusCode.OK)
         {