Move BodyQueryResult column mapping to Fluent API

Replaced data annotation with Fluent API configuration for BodyQueryResult.RawBody column mapping in RecDbContext, centralizing entity configuration and removing the [Column("REQUEST_BODY")] attribute from the entity class.

src/ReC.Domain/Entities/BodyQueryResult.cs.cs

@@ -1,9 +1,6 @@
-using System.ComponentModel.DataAnnotations.Schema;
-
-namespace ReC.Domain.Entities;
+namespace ReC.Domain.Entities;
 
 public class BodyQueryResult
 {
-    [Column("REQUEST_BODY")]
     public string? RawBody { get; init; }
-}
+}