feat: enforce required department and role codes with validation

- Updated DeptModel and RoleModel to make the `code` field mandatory and unique.
- Enhanced DeptCreateSchema and RoleCreateSchema to require a valid `code` format, ensuring it starts with a letter and is 2-16 characters long.
- Implemented validation logic in the backend to check for existing codes during updates, preventing duplicates.
- Adjusted frontend forms to reflect the required `code` field and added validation messages for user guidance.

backend/app/api/v1/module_system/role/model.py

@@ -74,8 +74,8 @@ class RoleModel(ModelMixin):
     __permission_strategy__: PermissionFilterStrategy = PermissionFilterStrategy.USER_ROLE
 
     name: Mapped[str] = mapped_column(String(64), nullable=False, comment="角色名称")
-    code: Mapped[str | None] = mapped_column(
-        String(16), nullable=True, index=True, comment="角色编码"
+    code: Mapped[str] = mapped_column(
+        String(16), nullable=False, unique=True, comment="角色编码"
     )
     order: Mapped[int] = mapped_column(Integer, nullable=False, default=999, comment="显示排序")
     data_scope: Mapped[int] = mapped_column(

backend/app/api/v1/module_system/role/schema.py

@@ -13,8 +13,8 @@ from app.common.enums import QueueEnum
 from app.core.base_schema import BaseSchema
 from app.core.validator import (
     DateTimeStr,
-    code_validator,
     role_permission_request_validator,
+    validate_required_code,
 )
 
 
@@ -22,7 +22,7 @@ class RoleCreateSchema(BaseModel):
     """角色创建模型"""
 
     name: str = Field(..., max_length=64, description="角色名称")
-    code: str | None = Field(default=None, max_length=16, description="角色编码")
+    code: str = Field(..., max_length=16, description="角色编码")
     order: int | None = Field(default=1, ge=1, description="显示排序")
     data_scope: int | None = Field(
         default=1,
@@ -33,20 +33,20 @@ class RoleCreateSchema(BaseModel):
 
     @field_validator("code")
     @classmethod
-    def validate_code(cls, value: str | None):
+    def validate_code(cls, value: str):
         """
-        校验角色编码（委托到 `code_validator`）。
+        校验角色编码（与部门编码规则一致，见 `validate_required_code`）。
 
         参数:
-        - value (str | None): 角色编码。
+        - value (str): 角色编码。
 
         返回:
-        - str | None: 校验后的角色编码。
+        - str: 校验后的角色编码。
 
         异常:
-        - CustomException: 不满足编码规则时抛出。
+        - ValueError: 不满足编码规则时抛出。
         """
-        return code_validator(value)
+        return validate_required_code(value)
 
 
 class RolePermissionSettingSchema(BaseModel):

backend/app/api/v1/module_system/role/service.py

@@ -125,6 +125,9 @@ class RoleService:
         exist_role = await RoleCRUD(auth).get(name=data.name)
         if exist_role and exist_role.id != id:
             raise CustomException(msg="更新失败，角色名称重复")
+        exist_code = await RoleCRUD(auth).get(code=data.code)
+        if exist_code and exist_code.id != id:
+            raise CustomException(msg="更新失败，角色编码已存在")
         updated_role = await RoleCRUD(auth).update(id=id, data=data)
         return RoleOutSchema.model_validate(updated_role).model_dump()