feat: перелопатил синхронизацию преподавателей

backend/UniVerse.Infrastructure/ExternalServices/ModeusApiClient.cs

@@ -1,4 +1,6 @@
 using System.Net.Http.Json;
+using System.Net;
+using System.Net.Http.Headers;
 using System.Text.Json;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
@@ -142,4 +144,20 @@ public class ModeusApiClient : IModeusApiClient
             $"/api/schedule/searchemployee?fullname={Uri.EscapeDataString(fullname)}");
         return response ?? new();
     }
+
+    public async Task<string?> GetSubIdByFullNameAsync(string fullname, CancellationToken cancellationToken = default)
+    {
+        using var request = new HttpRequestMessage(
+            HttpMethod.Get,
+            $"/api/universe/subid?fullname={Uri.EscapeDataString(fullname)}");
+        request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain"));
+
+        using var response = await _http.SendAsync(request, cancellationToken);
+        if (response.StatusCode == HttpStatusCode.NotFound)
+            return null;
+
+        await EnsureSuccessAsync(response, "Universe user sub lookup", $"fullname={fullname}");
+        var body = await response.Content.ReadAsStringAsync(cancellationToken);
+        return string.IsNullOrWhiteSpace(body) ? null : body.Trim();
+    }
 }