Fix ruff violations (import sort, unused imports, whitespace) in
backup_database.py, generate_website.py, meshcore_bot.py,
migrate_webviewer_db.py, packet_capture_service.py, version_info.py,
scripts/config_tui.py, scripts/update_todos.py, and validate_config.py.
Fix mypy stale type-ignore and remove unused imports in test files.
Add is_radio_zombie/is_radio_offline mock attributes to command_manager
test fixtures to prevent truthy Mock early returns.
- Replaced direct SQLite connection calls with a context manager in various modules to ensure proper resource management and prevent file descriptor leaks.
- Introduced a new `connection` method in `DBManager` to standardize connection handling.
- Updated all relevant database interactions in modules such as `feed_manager`, `scheduler`, `commands`, and others to utilize the new connection method.
- Improved code readability and maintainability by consolidating connection logic.
Stacy Olivas