feat: Add role code to system_role.json and update system_users.json creator_id to null

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

backend/app/scripts/data/system_users.json

@@ -12,7 +12,7 @@
     "last_login": null,
     "dept_id": 1,
     "description": "管理员",
-    "creator_id": 1
+    "creator_id": null
   },
   {
     "username": "demo",