feat(oa): CC designer multi-select and preview assigneeTypes support

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

web-admin/src/api/oaApproval.ts

@@ -251,6 +251,7 @@ export type OaFlowPreviewStep = {
   name: string
   signMode?: string
   assigneeType?: string
+  assigneeTypes?: string[]
   meta?: string
   people?: Array<{ id: string; nickName: string }>
   resolveError?: string