Fix: Remove parent class nesting from implicit DTOs in hash namespaces

[Copilot]

When NestedDtoUseHashNamespace is enabled (default), auto-generated DTOs were incorrectly nested inside parent class structures. For classes defined within other classes, implicit DTOs should be placed directly in the LinqraftGenerated_{hash} namespace without inheriting the parent class hierarchy.

Changes

• SelectExprInfoExplicitDto.GenerateDtoClasses(): Clear ParentClasses and ParentAccessibilities for implicit DTOs when using hash namespace
• SelectExprInfoExplicitDto.GetNestedDtoFullNameFromStructure(): Remove parent class path from fully qualified names for implicit DTOs

Before

namespace MinRepro.LinqraftGenerated_B1FE66BC
{
    public partial class ClassInClassGeneratedExpr  // Unwanted wrapper
    {
        internal partial class ItemsDto { ... }
    }
}
// Type name: MinRepro.LinqraftGenerated_B1FE66BC.ClassInClassGeneratedExpr+ItemsDto

After

namespace MinRepro.LinqraftGenerated_B1FE66BC
{
    internal partial class ItemsDto { ... }  // Direct placement
}
// Type name: MinRepro.LinqraftGenerated_B1FE66BC.ItemsDto

Explicit DTOs from SelectExpr<TIn, TResult> retain their parent class structure as expected.

Original prompt

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This section details on the original issue you should resolve

<issue_title>bug: Minor issues when generating multi-layer DTO classes for classes nested within other classes</issue_title>
<issue_description>### Minimal Reproducible Example

using System.Collections.Generic;
using System.Linq;

namespace MinRepro;

public partial class ClassInClassGeneratedExpr
{
    private readonly List<NestedEntity> TestData = [];

    public void NestedSelectExpr_WithExplicitDtoTypes_ShouldWork()
    {
        var query = TestData.AsQueryable();

        var result = query
            .SelectExpr<NestedEntity, NestedEntityDto>(x => new
            {
                x.Id,
                x.Name,
                Items = x.Items.Select(i => new { i.Id }),
            })
            .ToList();
    }

    internal class NestedEntity
    {
        public int Id { get; set; }
        public string Name { get; set; } = null!;
        public List<NestedItem> Items { get; set; } = [];
    }

    internal class NestedItem
    {
        public int Id { get; set; }
        public string Title { get; set; } = null!;
    }

    internal partial class NestedEntityDto;
}

Generated Output

// <auto-generated>
// This file is auto-generated by Linqraft.
//   Linqraft Version  : 0.7.0-alpha.8+19d8834e72
//   Linqraft Build at : 2025-12-06 21:57:55
//   Code Generated at : 2025-12-06 22:31:30
// </auto-generated>
#nullable enable
#pragma warning disable IDE0060
#pragma warning disable CS8601
#pragma warning disable CS8602
#pragma warning disable CS8603
#pragma warning disable CS8604
#pragma warning disable CS8618
using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.Immutable;
namespace Linqraft
{
    file static partial class GeneratedExpression
    {
        /// <summary>
        /// generated select expression method NestedEntityDto (explicit) <br/>
        /// at Program.cs(15,14)
        /// </summary>
        [global::System.Runtime.CompilerServices.InterceptsLocationAttribute(1, "mxAVfMKd/PKy75pHI2JqZFIBAABQcm9ncmFtLmNz")]
        public static IQueryable<TResult> SelectExpr_6EE9AC98_0462FB50<TIn, TResult>(
            this IQueryable<TIn> query, Func<TIn, object> selector)
        {
            var matchedQuery = query as object as IQueryable<global::MinRepro.ClassInClassGeneratedExpr.NestedEntity>;
            var converted = matchedQuery.Select(x => new global::MinRepro.ClassInClassGeneratedExpr.NestedEntityDto
            {
                Id = x.Id,
                Name = x.Name,
                Items = x.Items
                    .Select(i => new global::MinRepro.LinqraftGenerated_B1FE66BC.ClassInClassGeneratedExpr.ItemsDto
                    {
                        Id = i.Id
                    })
            });
            return converted as object as IQueryable<TResult>;
        }

    }
}
namespace MinRepro
{
    public partial class ClassInClassGeneratedExpr
    {
        /// <remarks>
        /// From: <c>NestedEntity</c>
        /// </remarks>
        internal partial class NestedEntityDto
        {
            /// <remarks>
            /// From: <c>NestedEntity.Id</c>
            /// </remarks>
            public required int Id { get; set; }
            /// <remarks>
            /// From: <c>NestedEntity.Name</c>
            /// </remarks>
            public required string Name { get; set; }
            /// <remarks>
            /// From: <c>NestedEntity.Items.Select(...)</c>
            /// </remarks>
            public required global::System.Collections.Generic.IEnumerable<MinRepro.LinqraftGenerated_B1FE66BC.ClassInClassGeneratedExpr.ItemsDto> Items { get; set; }
        }
    }

}
namespace MinRepro.LinqraftGenerated_B1FE66BC
{
    public partial class ClassInClassGeneratedExpr
    {
        /// <remarks>
        /// From: <c>NestedItem</c>
        /// </remarks>
        [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
        [global::Linqraft.LinqraftAutoGeneratedDtoAttribute]
        internal partial class ItemsDto
        {
            /// <remarks>
            /// From: <c>NestedItem.Id</c>
            /// </remarks>
            public required int Id { get; set; }
        }
    }

}

Expected Output

• The definition of ItemsDto does not need to exist inside the class ClassInClassGeneratedExpr.
  • Implicit DTO definitions are managed by hashes, so they do not need to exist within a class.

Additional Information

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes bug: Minor issues when generating multi-layer DTO classes for classes nested within other classes #218

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