Move BasePostgresUser; add BaseUserDto class

- Relocated BasePostgresUser from BaseUser.cs to BasePostgresUser.cs.
- Removed BaseUser.cs.
- Introduced BaseUserDto in BaseUserDto.cs for user API data transfer.

Author: Vadim Belov

…rameworkCore.Npgsql/Database/BaseUser.cs …Core.Npgsql/Database/BasePostgresUser.csSources/EasyExtensions.EntityFrameworkCore.Npgsql/Database/BaseUser.cs renamed to Sources/EasyExtensions.EntityFrameworkCore.Npgsql/Database/BasePostgresUser.cs Sources/EasyExtensions.EntityFrameworkCore.Npgsql/Database/BaseUser.cs renamed to Sources/EasyExtensions.EntityFrameworkCore.Npgsql/Database/BasePostgresUser.cs

@@ -0,0 +1,40 @@
+using EasyExtensions.Models.Enums;
+using System;
+
+namespace EasyExtensions.Models.Dto
+{
+    /// <summary>
+    /// Represents the base data transfer object for a user, including common user profile information and role
+    /// assignment.
+    /// </summary>
+    /// <remarks>This class provides fundamental user properties for use in API requests and responses. It is
+    /// intended to be inherited by more specialized user DTOs as needed. The properties include identification, contact
+    /// information, activation status, and role assignment.</remarks>
+    public class BaseUserDto : BaseDto<Guid>
+    {
+        /// <summary>
+        /// Gets or sets the first name of the person.
+        /// </summary>
+        public string FirstName { get; set; } = null!;
+
+        /// <summary>
+        /// Gets or sets the last name of the person.
+        /// </summary>
+        public string LastName { get; set; } = null!;
+
+        /// <summary>
+        /// Gets or sets the email address associated with the user.
+        /// </summary>
+        public string Email { get; set; } = null!;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the instance is currently active.
+        /// </summary>
+        public bool IsActive { get; set; }
+
+        /// <summary>
+        /// Gets or sets the role assigned to the user.
+        /// </summary>
+        public UserRole Role { get; set; }
+    }
+}