Added return type and improve formatting in UploadMap map method #86
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Description:
Add precise PHPDoc with iterable value types to UploadMap::map() method
Added detailed return type annotation for the map() method in UploadMap class to specify array key and callable value types.
This improves static analysis by PHPStan and removes the "missing value type in iterable" warning.
No functional changes, only type safety and code clarity improvements.