Add DotFolderByPath GraphQL root query for folder tree browsing

[fmontes]

Description

Currently, folders in dotCMS GraphQL are only accessible as nested fields on contentlets (via the DotFolder type and FolderFieldDataFetcher). There is no way to query folders directly as a top-level query.

Add a DotFolder root query that returns the folder at a given path with recursive sub-folder traversal through a children field — enabling full folder tree browsing via GraphQL.

Expected usage:

query {
  DotFolder(path: "/application/") {
    folderTitle
    folderPath
    children {
      folderTitle
      folderPath
      children {
        folderTitle
        folderPath
      }
    }
  }
}

Acceptance Criteria

• DotFolder(path: String!) root query exists in the GraphQL schema
• Returns the single folder at the given path (not a flat list of all sub-folders)
• Sub-folders are accessible via the recursive children field
• Nested children queries work to arbitrary depth (up to configurable max)
• Returns null when folder path does not exist
• Respects user permissions
• Max recursion depth is configurable
• Unit tests pass
• Integration tests verify schema structure

[github-actions]

PRs linked to this issue

• Add DotFolder GraphQL root query for folder tree browsing by @fmontes