refactor: Remove TTS related files and controller for cleaner codebase

fix: Improve microphone permission request with explanation context

style: Clean up user settings view and improve toast utility

chore: Update asset picker to streamline permission checks

fix: Update SQL manager for better database handling and query efficiency

chore: Update constants for user agreements with versioning

refactor: General code cleanup and formatting across multiple files

- Updated HttpService to enhance header management and error handling.
- Improved Access utility to include permission explanation dialogs before requesting permissions.
- Modified AssetsPicker to check for permissions before accessing the camera or gallery.
- Adjusted constants for server URLs and agreements for better maintainability.
- Cleaned up pubspec.yaml and pubspec.lock by removing unused dependencies.

This reverts commit 516705b4.

This reverts commit 7d3acb1f.

This reverts commit 3e998548.

# Conflicts:
#   lib/utils/constants.dart

Test

查看合并请求 kiwitap/zijing-app!26