- Updated timestamp fields across the codebase from `*_ts` to `*_at` for consistency and clarity.
- Renamed constants for node status from "on"/"off" to "online"/"offline" to better reflect their meanings.
- Enhanced validation and error handling in various components to ensure data integrity.
- Refactored test cases to align with the new naming conventions and improve readability.
- Improved error messages in the FileLogDriver's cleanup method to include error details for better debugging.
- Updated the default task log path from '/app/logs/tasks' to '/var/log/crawlab/tasks' to ensure consistency across environments.
- Replaced all instances of apex/log with a structured logger interface in various services, including Api, Server, Config, and others, to enhance logging consistency and context.
- Updated logging calls to utilize the new logger methods, improving error tracking and service monitoring.
- Added logger initialization in services and controllers to ensure proper logging setup.
- Improved error handling and logging messages for better clarity during service operations.
- Removed unused apex/log imports and cleaned up related code for better maintainability.
