fix: keep approval batching internal

src/unified-approval.ts

@@ -260,14 +260,7 @@ export class UnifiedApprovalService {
           digest: this.approvalSelectionDigest(user, returnedItems),
           exp: expiresInMinutes(15),
         } satisfies ApprovalSelectionReference),
-        selectionHint: "selectionId 精确绑定本次列表结果；仅在用户明确要求处理整组时使用，执行前会重新实时核对。",
-      } : issueSelection ? { selectionUnavailableReason } : {}),
-      batchPolicy: {
-        maxItemsPerCall: APPROVAL_BATCH_LIMIT,
-        selectionAvailable,
-        ...(!selectionAvailable ? { selectionUnavailableReason } : {}),
-        overflowGuidance: `一次最多处理 ${APPROVAL_BATCH_LIMIT} 条。超过时可从同一次列表结果中选取 approvalId 分组提交；每组仍须经用户明确授权。`,
-      },
+      } : {}),
       sourceStatus,
       diagnostics: { realtime: true, persistedBusinessData: false },
     };