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/api/v1/module_example/demo/schema.py

@@ -10,7 +10,7 @@ class DemoCreateSchema(BaseModel):
     """新增模型"""
     name: str = Field(..., max_length=50, description='名称')
     status: bool = Field(True, description="是否启用(True:启用 False:禁用)")
-    description: Optional[str] = Field(None, max_length=255, description="描述")
+    description: Optional[str] = Field(default=None, max_length=255, description="描述")
 
 
 class DemoUpdateSchema(DemoCreateSchema):