128985af17
## purchase.py
- GET /purchase (列表): @jwt_required, 有权限看同公司全部/无权限只看自己
- POST /purchase (创建): @jwt_required, 任何登录用户可提交
- GET /purchase/<id> (详情): @jwt_required, 自己的或有权者可见
- PATCH /purchase/<id>/approve (审批): @permission_required('inbound_purchase:operation')
不再硬编码 SUPERVISOR 角色, 有操作权限即可审批
- GET /purchase/approvers, /auto-fill, /search-material: @jwt_required (开放给创建流程)
- 新增 _user_has_purchase_perm() 统一权限检查
- 移除所有硬编码 role in ('SUPERVISOR','SUPER_ADMIN')
## purchase_service.py
- send_email → send_email_async (采购审批邮件异步发送)
## purchase/index.vue
- canApprove: 仅检查 inbound_purchase:operation (菜单权限≠审批权限)
- customUpload: 修复 v-model:file-list 重复推入导致图片双份显示
- auth.py → purchase.py 权限前缀统一