feat(News): refactor news service and add sentiment tracking

FinlyticNews/Entities/ArticleSourceEntity.cs

@@ -0,0 +1,33 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Represents a news or feed source configuration retrieved from the database to discover article links.
+/// </summary>
+public class ArticleSourceEntity
+{
+    /// <summary>
+    /// Gets or sets the unique primary key identifier.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    /// <summary>
+    /// Gets or sets the target URL or domain feed address (e.g., RSS XML URL or HTML listing URL).
+    /// </summary>
+    [Required]
+    public string Source { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the human-readable display name of the news provider.
+    /// </summary>
+    [Required]
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the adapter type keyword used to resolve the parsing adapter (e.g., "rss", "finanznachrichten").
+    /// </summary>
+    [Required]
+    public string Type { get; set; } = string.Empty;
+}