feat: 增加审批步骤发起人部门限制

- 增加配置期与提审期合法审批账号校验

- 冻结发起人部门并统一待办与办理权限判断

- 增加兼容迁移、前端联动和自动化测试

easyflow-ui-admin/app/src/locales/langs/en-US/approval.json

@@ -82,6 +82,8 @@
     "finishedAt": "Finished At",
     "assigneeType": "Assignee Type",
     "assigneeTarget": "Assignee",
+    "restrictToApplicantDept": "Applicant department only",
+    "applicantDept": "Applicant Department",
     "selectedDeptCount": "Selected departments: {value}",
     "actedBy": "Acted By",
     "actedAt": "Acted At",
@@ -118,6 +120,7 @@
     "needStep": "At least one step is required",
     "needStepAssignee": "Each approval step requires an assignee",
     "confirmAssigneeTypeChange": "Changing the assignee type clears the current selections. Continue?",
+    "confirmApplicantDeptRestriction": "This will switch to role approval and clear selected departments. Continue?",
     "saveSuccess": "Flow saved",
     "statusUpdated": "Flow status updated",
     "deleteSuccess": "Flow deleted",