feat(oa): terminate on return and copy form to start a new instance

Align with DingTalk: returned/rejected/cancelled are terminal; progress
shows return on the approver task only; done list includes returned;
deprecate same-instance resubmit and source-instance linking.

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/api/oaApproval.ts

@@ -210,7 +210,6 @@ export function fetchStartOaInstance(data: {
   initiatorDeptId?: string
   initiatorSelectUserIds?: string[]
   relatedInstanceIds?: string[]
-  sourceInstanceId?: string
 }) {
   return request.post({
     url: `${BASE}/instances`,
@@ -269,17 +268,6 @@ export function fetchReturnOaTask(taskId: string, comment: string) {
   })
 }
 
-export function fetchResubmitOaInstance(
-  id: string,
-  data: { formData?: Record<string, any>; initiatorSelectUserIds?: string[] }
-) {
-  return request.post({
-    url: `${BASE}/instances/${id}/resubmit`,
-    data,
-    showSuccessMessage: true
-  })
-}
-
 export function fetchAddSignOaTask(
   taskId: string,
   data: { userIds: string[]; comment?: string }