feat(news): add scraper adapters, article deduplication, blocklist service, and remove tracked publish artifacts

FinlyticNews/Entities/NewsArticleEntity.cs

@@ -57,11 +57,22 @@ public class NewsArticleEntity
     public DateTime PublishedAt { get; set; }
 
     /// <summary>
-    /// Gets or sets the processing lifecycle state (e.g., "Pending", "Processing", "Completed", "Analyzed", "Failed").
+    /// Gets or sets the processing lifecycle state (e.g., "Pending", "Processing", "Completed", "Analyzed", "Failed", "Duplicate").
     /// </summary>
     [Required]
     public string Status { get; set; } = "Pending";
 
+    /// <summary>
+    /// Gets or sets the normalized SHA-256 hash of the cleaned title for duplicate detection.
+    /// </summary>
+    [MaxLength(64)]
+    public string? TitleHash { get; set; }
+
+    /// <summary>
+    /// Gets or sets the 64-bit SimHash content fingerprint for fuzzy duplicate text detection.
+    /// </summary>
+    public long? SimHash { get; set; }
+
     /// <summary>
     /// Gets or sets the list of financial assets matched and associated with this news article.
     /// </summary>