feat: implement foreground service for android version

[nini22P]

This will keep the application running in the background for a long time.

[gemini-code-assist]

Summary of Changes

Hello @nini22P, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Android application by introducing persistent notifications for better user engagement and accessibility. It also includes a substantial refactoring effort to improve the app's modularity and maintainability, separating key functionalities and UI components. Additionally, the changes incorporate an exit confirmation dialog for a better user experience, update the Android API target and dependencies, and add a robustness improvement to the backend's directory handling.

Highlights

• Persistent Notifications: Implemented an ongoing notification for the Android application, providing quick access to the app's local web interface and status. This includes setting up notification channels and handling permission requests for Android 13 (API 33) and above.
• Android App Refactoring: Undertook a significant architectural refactoring of the Android application. Core functionalities such as asset management and notification handling have been extracted into dedicated modules, and Compose UI components have been modularized into separate files for improved maintainability and separation of concerns.
• Exit Confirmation Dialog: Introduced a confirmation dialog that appears when the user attempts to exit the application, warning about potential unsaved data loss. This enhances the user experience by preventing accidental exits.
• Dependency Updates and API Target: Updated various Android, Compose, and Kotlin dependencies, and raised the target API level to 33, aligning the application with newer Android versions and their features.
• Backend Robustness Improvement: Enhanced the backend logic to proactively check for the existence of the Derivative_Engine directory and create it if it's missing, ensuring smoother operation and preventing potential errors during directory access.

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[gemini-code-assist]

Code Review

This pull request introduces a notification feature for the Android app. It also refactors MainActivity by extracting UI components and utility functions into separate files, improving code organization. A confirmation dialog is added for the back-press action.