Add comprehensive logs management system to Maintenance page
- Add new Logs tab to Maintenance page with filtering and search capabilities
- Implement backend API endpoints (/api/logs/) for log viewing, filtering, and management
- Create LogsPanel.vue component with log level filtering, text search, and file operations
- Add logs.js API client for frontend-backend communication
- Support copy to clipboard, clear logs, and refresh functionality
- Include proper error handling and responsive design
- Fix Docker environment detection in log path resolution
- Register logs blueprint in Flask application routing