Includedir recursive option

[KhallG]

feat(util): add optional recursive parameter to IncludeDir

Add bRecursive parameter to ix.util.IncludeDir to allow optional
recursive inclusion of subdirectories. When false, only files in
the specified directory are included, without traversing subdirectories.

• Add bRecursive as third optional parameter
• Add file extension check to filter .lua files only
• Update function documentation with new parameter
• Maintain backward compatibility

[Copilot]

Pull request overview

This PR adds optional recursive directory inclusion functionality to the ix.util.IncludeDir function, allowing developers to optionally include Lua files from subdirectories when loading plugins or schemas.

Key changes:

• Added bRecursive as a third optional parameter to control recursive subdirectory traversal
• Modified file.Find to return both files and directories by changing the pattern from /*.lua to /*
• Added explicit .lua file extension filtering using string.EndsWith

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[Copilot]

The 'dirs' variable returned from file.Find may be nil if no directories are found. Attempting to iterate over nil with ipairs will cause a runtime error. The dirs variable should be checked for nil or defaulted to an empty table before iteration.

[Copilot]

The 'files' variable returned from file.Find may be nil if no files are found. Attempting to iterate over nil with ipairs will cause a runtime error. The files variable should be checked for nil or defaulted to an empty table before iteration.