fix: usage relative file path in ResourceAlreadyExistsException

[AZabolotnikov]

refs: #179

[Copilot]

Pull Request Overview

This PR fixes the usage of relative file paths in ResourceAlreadyExistsException messages by removing the "vfs://root" prefix from file paths and ensuring consistency with relative paths starting with "/".

Key changes:

• Updated the EntityGenerator to return relative paths instead of absolute paths from getClassPath()
• Modified ResourceAlreadyExistsException to prepend "/" to file paths in error messages
• Updated all test files to expect the new relative path format in exception messages

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

File	Description
src/Generators/EntityGenerator.php	Modified classExists() and getClassPath() methods to handle relative vs absolute paths properly
src/Exceptions/ResourceAlreadyExistsException.php	Added "/" prefix to file path in exception message
tests/*.php	Updated test expectations to match new relative path format in exception messages

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