- Add onsubmit handler to prevent default form submission
- Add addSubtask() function for AJAX form submission
- Update subtasks list dynamically after adding
- Add updateSubtasksCount() helper function
- Create task_subtasks table migration
- Create TaskSubtaskModel with CRUD operations
- Add subtask API methods: addSubtask, toggleSubtask, deleteSubtask
- Update TaskService to include subtasks in getTask()
- Add Routes for subtasks API
- Update show.twig with subtasks UI and JavaScript