Refactor repository path logic and add locally tracked method

[roble]

This pull request refactors the logic for detecting locally managed packages in the installer. The main change is the extraction of path repository detection into a new, more general method, improving code clarity and maintainability.

Refactoring and logic improvement:

• Extracted the logic for checking if a package is a path repository into a new method isLocallyTracked, which determines if a given install path is either a symlink or a git-tracked directory. The isPathRepository method now delegates to this new method for improved clarity and reusability.
• Updated and clarified documentation for both methods to better explain the distinction between genuine path repositories and Packagist-installed modules, and to document why certain paths are protected from being overwritten.

[Copilot]

Pull request overview

This PR refactors the installer’s “path repository” detection by extracting the install-path checks into a new helper method, aiming to more clearly distinguish locally managed module directories from normal Packagist-installed modules.

Changes:

• Refactored isPathRepository() to delegate install-path checks to a new isLocallyTracked(string $path) helper.
• Added/updated docblocks to clarify which install paths should be protected from being overwritten.

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