feat(Core): update DTOs and shared models

FinlyticCore/Dtos/News/NewsRequests.cs

@@ -0,0 +1,20 @@
+using System.Text.Json.Serialization;
+
+namespace FinlyticCore.Dtos.News;
+
+/// <summary>
+/// Request payload sent by downstream services (e.g., FinlyticSentiment) to update the processing status of a news article.
+/// </summary>
+public record UpdateNewsStatusRequest(
+    [property: JsonPropertyName("id")]     Guid   Id,
+    [property: JsonPropertyName("status")] string Status
+);
+
+/// <summary>
+/// Response payload returned to verify the success of the status update operation.
+/// </summary>
+public record UpdateNewsStatusResponse(
+    [property: JsonPropertyName("success")] bool    Success,
+    [property: JsonPropertyName("message")] string? Message = null
+);
+