Add RecAction entity mapped to TBREC_CFG_ACTION table

Introduced the `RecAction` class in the `ReC.Domain.Entities`
namespace to represent the `TBREC_CFG_ACTION` database table.
Added data annotations for table and column mapping, including
a primary key (`Guid`) and other properties for database fields
such as `ProfileId`, `Active`, `Sequence`, and query-related
fields. Included auditing fields (`AddedWho`, `AddedWhen`,
`ChangedWho`, `ChangedWhen`) for tracking changes. All fields
are nullable to handle missing data gracefully.

src/ReC.Domain/Entities/RecAction.cs

@@ -0,0 +1,60 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ReC.Domain.Entities;
+
+[Table("TBREC_CFG_ACTION")]
+public class RecAction
+{
+    [Key]
+    [Column("GUID")]
+    public long? Guid { get; set; }
+
+    [Column("PROFILE_ID")]
+    public long? ProfileId { get; set; }
+
+    [Column("ACTIVE")]
+    public bool? Active { get; set; }
+
+    [Column("SEQUENCE")]
+    public byte? Sequence { get; set; }
+
+    [Column("ENDPOINT_ID")]
+    public long? EndpointId { get; set; }
+
+    [Column("ENDPOINT_AUTH_ID")]
+    public long? EndpointAuthId { get; set; }
+
+    [Column("ENDPOINT_PARAMS_ID")]
+    public short? EndpointParamsId { get; set; }
+
+    [Column("SQL_CONNECTION_ID")]
+    public short? SqlConnectionId { get; set; }
+
+    [Column("TYPE")]
+    public string? Type { get; set; }
+
+    [Column("PREPROCESSING_QUERY")]
+    public string? PreprocessingQuery { get; set; }
+
+    [Column("HEADER_QUERY")]
+    public string? HeaderQuery { get; set; }
+
+    [Column("BODY_QUERY")]
+    public string? BodyQuery { get; set; }
+
+    [Column("POSTPROCESSING_QUERY")]
+    public string? PostprocessingQuery { 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; }
+}