Fix nested SelectExpr interceptor generation

[Copilot]

When SelectExpr is used inside another SelectExpr, the generator was incorrectly producing a separate interceptor and DTO class for the inner call. The inner SelectExpr should only be converted to a regular Select by the outer one—no separate interceptor needed.

// Inner SelectExpr was generating its own interceptor + LinqraftGenerated_HASH.ItemsDto
query.SelectExpr<Entity, EntityDto>(x => new {
    Items = x.Items.SelectExpr<Item, ItemDto>(i => new { i.Id })
});

Changes

• SelectExprGenerator.cs: Added IsNestedInsideAnotherSelectExpr to skip interceptor generation for nested SelectExpr invocations
• SelectExprInfoExplicitDto.cs: When generating DTOs for nested structures, use the explicit type name from inner SelectExpr<TIn, TResult> rather than auto-generating a hash-based name; skip hash-namespace placement for these explicit DTOs

Result

• Single interceptor generated (outer only)
• Explicit DTO types (ItemDto) placed in user namespace
• Auto-generated DTOs (from regular Select) still use hash namespace
• No orphan DTO classes in LinqraftGenerated_* namespaces

Original prompt

---

This section details on the original issue you should resolve

<issue_title>bug: In nested SelectExpr, interceptors for the inner SelectExpr are generated incorrectly.</issue_title>
<issue_description>### Minimal Reproducible Example

The test case of Issue207_NestedSelectExprTest as it is.

Generated Output

namespace Linqraft
{
    file static partial class GeneratedExpression
    {
        /// <summary>
        /// generated select expression method NestedEntity207Dto (explicit) <br/>
        /// at Issue207_NestedSelectExprTest.cs(74,14)
        /// </summary>
        [global::System.Runtime.CompilerServices.InterceptsLocationAttribute(1, "/kj/2iWhKnhvxrTVTWp3ao4JAABJc3N1ZTIwN19OZXN0ZWRTZWxlY3RFeHByVGVzdC5jcw==")]
        public static IQueryable<TResult> SelectExpr_5C648E5B_3F501B38<TIn, TResult>(
            this IQueryable<TIn> query, Func<TIn, object> selector)
        {
            var matchedQuery = query as object as IQueryable<global::Linqraft.Tests.Issue207_NestedSelectExprTest.NestedEntity207>;
            var converted = matchedQuery.Select(x => new global::Linqraft.Tests.NestedEntity207Dto
            {
                Id = x.Id,
                Name = x.Name,
                Items = x.Items
                    .Select(i => new global::Linqraft.Tests.NestedItem207Dto
                    {
                        Id = i.Id,
                        Title = i.Title,
                        SubItem = i.SubItems
                            .Select(si => new global::Linqraft.Tests.LinqraftGenerated_0361ED9F.SubItemDto
                            {
                                Id = si.Id,
                                Value = si.Value
                            })
                    })
            });
            return converted as object as IQueryable<TResult>;
        }

        /// <summary>
        /// generated select expression method NestedItem207Dto (explicit) <br/>
        /// at Issue207_NestedSelectExprTest.cs(79,33)
        /// </summary>
        [global::System.Runtime.CompilerServices.InterceptsLocationAttribute(1, "/kj/2iWhKnhvxrTVTWp3ao0KAABJc3N1ZTIwN19OZXN0ZWRTZWxlY3RFeHByVGVzdC5jcw==")]
        public static IEnumerable<TResult> SelectExpr_8678544C_B426BEC2<TIn, TResult>(
            this IEnumerable<TIn> query, Func<TIn, object> selector)
        {
            var matchedQuery = query as object as IEnumerable<global::Linqraft.Tests.Issue207_NestedSelectExprTest.NestedItem207>;
            var converted = matchedQuery.Select(i => new global::Linqraft.Tests.NestedItem207Dto
            {
                Id = i.Id,
                Title = i.Title,
                SubItem = i.SubItems
                    .Select(si => new global::Linqraft.Tests.LinqraftGenerated_0361ED9F.SubItemDto
                    {
                        Id = si.Id,
                        Value = si.Value
                    })
            });
            return converted as object as IEnumerable<TResult>;
        }

    }
}
namespace Linqraft.Tests
{
    /// <summary>
    /// Test data classes for the nested SelectExpr test
    /// </summary>
    /// <remarks>
    /// From: <c>NestedEntity207</c>
    /// </remarks>
    public partial class NestedEntity207Dto
    {
        /// <remarks>
        /// From: <c>NestedEntity207.Id</c>
        /// </remarks>
        public required int Id { get; set; }
        /// <remarks>
        /// From: <c>NestedEntity207.Name</c>
        /// </remarks>
        public required string Name { get; set; }
        /// <remarks>
        /// From: <c>NestedEntity207.Items.SelectExpr&lt;NestedItem207,NestedItem207Dto&gt;(i=&gt;new{i.Id,i.Title,SubItem=i.SubItems.Select(...),})</c>
        /// </remarks>
        public required global::System.Collections.Generic.IEnumerable<Linqraft.Tests.NestedItem207Dto> Items { get; set; }
    }

    /// <remarks>
    /// From: <c>NestedItem207</c>
    /// </remarks>
    public partial class NestedItem207Dto
    {
        /// <remarks>
        /// From: <c>NestedItem207.Id</c>
        /// </remarks>
        public required int Id { get; set; }
        /// <remarks>
        /// From: <c>NestedItem207.Title</c>
        /// </remarks>
        public required string Title { get; set; }
        /// <remarks>
        /// From: <c>NestedItem207.SubItems.Select(...)</c>
        /// </remarks>
        public required global::System.Collections.Generic.IEnumerable<Linqraft.Tests.LinqraftGenerated_0361ED9F.SubItemDto> SubItem { get; set; }
    }

}
namespace Linqraft.Tests.LinqraftGenerated_0361ED9F
{
    /// <remarks>
    /// From: <c>NestedSubItem207</c>
    /// </remarks>
    [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
    [Linqraft.LinqraftAutoGeneratedDtoAttribute]
    public partial class SubItemDto
    {
        /// <remarks>
        /// From: <c>NestedSubItem207.Id</c>
        /// </remarks>
        public required int Id { get; set; }
        ...

</details>

- Fixes arika0093/Linqraft#212

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