Fixed bugs and made improvements for GitHub issues

[DanielcoderX]

This pull request addresses several key issues and implements enhancements to improve the project's functionality and user experience:

Key Changes:

1. Implemented a request to disable battery optimization, ensuring uninterrupted background service activity.
2. Resolved an issue related to background service activity and wake lock usage, enhancing the app's stability.
3. Fixed a bug associated with the notification disconnect button, ensuring its proper functionality.
4. Addressed an issue where the disconnect button was unresponsive during the connecting phase, allowing users to abort the process effectively.
5. Implemented a check to ensure the app's compatibility with Android 11 and above.
6. Added functionality to stop the VPN if the user is not connected to the internet within 3 seconds, with a 5-second wait at startup, optimizing resource usage.
7. Renamed "bug" references to "log" for clarity.
8. Updated deprecated APIs to maintain compatibility and improve performance.

Testing:

• Conducted thorough testing to verify the stability and reliability of the implemented changes.
• Ensured compatibility across various Android versions and device configurations.
• Tested the app's behavior in scenarios involving battery optimization, background activity, and network connectivity issues.

Impact:

• These changes enhance the app's reliability, performance, and user experience.
• Users will benefit from improved stability and responsiveness, especially in scenarios involving background services and network connectivity management.