Remove EF Core data annotations from EndpointParam class

Refactored EndpointParam by removing all Entity Framework Core
data annotations and related using directives. The class now
contains only plain C# properties, with database mapping
responsibilities likely moved to Fluent API or another ORM
configuration approach.

src/ReC.Domain/Entities/EndpointParam.cs

@@ -1,47 +1,31 @@
-using System.ComponentModel.DataAnnotations;
+namespace ReC.Domain.Entities;
-using System.ComponentModel.DataAnnotations.Schema;
-
-namespace ReC.Domain.Entities;
 
 /// <summary>
 /// Represents the TBREC_CFG_ENDPOINT_PARAMS table.
 /// All properties are nullable to provide flexibility on the database side,
 /// preventing breaking changes if columns are altered to be nullable in production.
 /// </summary>
-[Table("TBREC_CFG_ENDPOINT_PARAMS", Schema = "dbo")]
 public class EndpointParam
 {
-    [Key]
-    [Column("GUID")]
     public long? Id { get; set; }
 
-    [Column("ACTIVE")]
     public bool? Active { get; set; }
 
-    [Column("DESCRIPTION")]
     public string? Description { get; set; }
 
-    [Column("GROUP_ID")]
     public short? GroupId { get; set; }
 
-    [Column("SEQUENCE")]
     public byte? Sequence { get; set; }
 
-    [Column("KEY")]
     public string? Key { get; set; }
 
-    [Column("VALUE")]
     public string? Value { get; set; }
 
-    [Column("ADDED_WHO")]
     public string? AddedWho { get; set; }
 
-    [Column("ADDED_WHEN")]
     public DateTime? AddedWhen { get; set; }
 
-    [Column("CHANGED_WHO")]
     public string? ChangedWho { get; set; }
 
-    [Column("CHANGED_WHEN")]
     public DateTime? ChangedWhen { get; set; }
 }