refactor: simplify singleton and improve NetworkInfo documentation

[Ahmedatef5O5]

Pull Request Description
Overview

This pull request refactors the NetworkInfo singleton implementation and improves the overall code clarity and documentation. No functional or behavioral changes are introduced.

Details

Refactored the singleton pattern to a clearer and safer implementation

Improved inline documentation for better readability and maintainability

Clarified platform-specific behavior and limitations

Preserved the existing public API to ensure full backward compatibility

Impact

No breaking changes

No runtime behavior changes

No API modifications

Testing

No additional tests were required as this change does not affect runtime logic or functionality.

Checklist

Public API remains unchanged

No breaking changes introduced

Code formatted according to Dart style guidelines

Documentation reviewed and updated

Description

Related Issues

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I titled the PR using Conventional Commits.
• I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• All existing and new tests are passing.
• The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change (please indicate that with a ! in the title as explained in Conventional Commits).
• No, this is not a breaking change.

[vbuberen]

This PR is clearly an AI generated and brings no value. I am rejecting this and asking you to pick some other repo to bump your stats of contributions.