fix: Refactor initialize.py to handle nested children data during initialization
feat: Implement tree structure traversal functions in common_util.py
chore: Update requirements.txt to specify sqlalchemy-crud-plus version and add rich
refactor: Change API endpoints in dept.ts and menu.ts to return tree structure
feat: Add code field to role, dept, and menu interfaces in respective TypeScript files
fix: Update dept and role Vue components to display and handle code field
docs: Add comprehensive project documentation for FastAPI Vue3 Admin