feat(iso): add isomorphic path module with cross-platform utilities

changelog.md

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+# Changelog
+
+## [5.1.0] - 2025-01-28
+
+### Added
+- New isomorphic path module at `/iso` export path for cross-platform path operations
+- `pathJoin()` function for joining paths across different platforms and environments
+- `fileUrlToPath()` function for converting file:// URLs to system paths
+- `pathToFileUrl()` function for converting system paths to file:// URLs
+- `dirname()` function for extracting directory from paths and URLs
+- Comprehensive test coverage for isomorphic path functions
+
+### Changed
+- Build system now uses tsfolders for multi-folder compilation
+- Package exports now use modern exports field instead of main/typings
+
+### Removed
+- Removed .gitlab-ci.yml file