后台审核改用后端批量接口 (#67)

依赖 app-server PR #164。

## 改动
- 低价审核、用户反馈仅勾选待审核记录
- 批量操作改为单次请求后端 `/bulk/approve` 或 `/bulk/reject`
- 按后端逐条结果展示成功/失败；失败项保留勾选，方便重试
- 采纳/拒绝所需的统一金币、原因、内部备注和用户回复保持原有校验与二次确认

## 验证
- `npm run build`
- `git diff --check`

---------

Co-authored-by: linkeyu <798648091@qq.com>
Reviewed-on: #67
Co-authored-by: linkeyu <linkeyu@wonderable.ai>
Co-committed-by: linkeyu <linkeyu@wonderable.ai>

src/lib/bulkAction.ts

@@ -0,0 +1,33 @@
+export interface BulkReviewItemResult {
+  id: number;
+  ok: boolean;
+  status: string | null;
+  error: string | null;
+}
+
+export interface BulkReviewResult {
+  total: number;
+  success: number;
+  failed: number;
+  items: BulkReviewItemResult[];
+}
+
+export const BULK_REVIEW_MAX = 50;
+
+export function failedReviewIds(result: BulkReviewResult): number[] {
+  return result.items.filter((item) => !item.ok).map((item) => item.id);
+}
+
+export function bulkFailureReasonText(result: BulkReviewResult): string {
+  const reasons = Array.from(
+    new Set(
+      result.items
+        .filter((item) => !item.ok)
+        .map((item) => item.error?.trim())
+        .filter((reason): reason is string => Boolean(reason)),
+    ),
+  );
+  if (!reasons.length) return '';
+  const visible = reasons.slice(0, 3);
+  return `；原因：${visible.join('；')}${reasons.length > visible.length ? '；…' : ''}`;
+}