feat: подробное отображение ошибок синхронизации

backend/UniVerse.Infrastructure/ExternalServices/ModeusApiClient.cs

@@ -23,7 +23,8 @@ public class ModeusApiClient : IModeusApiClient
     {
         var body = new { specialtyCode = request.SpecialtyCode, timeMin = request.TimeMin, timeMax = request.TimeMax, typeId = request.TypeId };
         var response = await _http.PostAsJsonAsync("/api/proxy/events/search", body);
-        response.EnsureSuccessStatusCode();
+        await EnsureSuccessAsync(response, "Modeus events search",
+            $"specialtyCode={request.SpecialtyCode ?? "<empty>"}, timeMin={request.TimeMin:O}, timeMax={request.TimeMax:O}, typeId=[{string.Join(", ", request.TypeId ?? [])}]");
         return await response.Content.ReadFromJsonAsync<ModeusEventsResponse>() ?? new(new());
     }
 
@@ -46,7 +47,8 @@ public class ModeusApiClient : IModeusApiClient
             };
 
             var response = await _http.PostAsJsonAsync("/api/proxy/rooms/search", body);
-            response.EnsureSuccessStatusCode();
+            await EnsureSuccessAsync(response, "Modeus rooms search",
+                $"name=<empty>, sort=+building.name,+name, size={pageSize}, page={page}, deleted=false");
 
             var payload = await response.Content.ReadFromJsonAsync<ModeusRoomsResponse>() ?? new ModeusRoomsResponse();
             allRooms.AddRange(payload.RoomItems);
@@ -59,6 +61,20 @@ public class ModeusApiClient : IModeusApiClient
         return new ModeusRoomsResponse { Rooms = allRooms };
     }
 
+    private static async Task EnsureSuccessAsync(HttpResponseMessage response, string operation, string requestSummary)
+    {
+        if (response.IsSuccessStatusCode) return;
+
+        var responseBody = await response.Content.ReadAsStringAsync();
+        if (responseBody.Length > 2000)
+            responseBody = string.Concat(responseBody.AsSpan(0, 2000), "...<truncated>");
+
+        throw new HttpRequestException(
+            $"{operation} failed with HTTP {(int)response.StatusCode} {response.ReasonPhrase}. Request: {requestSummary}. Response body: {responseBody}",
+            null,
+            response.StatusCode);
+    }
+
     public async Task<List<ModeusEmployee>> SearchEmployeeAsync(string fullname)
     {
         var response = await _http.GetFromJsonAsync<List<ModeusEmployee>>(