功能：完善渠道模型批量操作

支持模型管理批量删除，并在拉取模型时提供全选、取消全选和选择数量提示。

同时保持首屏品牌中立，补充后端原子删除与管理员界面回归测试。

web/src/services/api/wallet.ts

@@ -295,6 +295,10 @@ export function deleteAdminChannelModel(channelId: string, id: string) {
     return request<{ ok: boolean }>(api.delete(`/admin/channels/${encodeURIComponent(channelId)}/models/${encodeURIComponent(id)}`));
 }
 
+export function deleteAdminChannelModels(channelId: string, modelIds: string[]) {
+    return request<{ deleted: number }>(api.post(`/admin/channels/${encodeURIComponent(channelId)}/models/batch-delete`, { modelIds }));
+}
+
 export type AdminFinanceListParams = { keyword?: string; status?: string; validity?: string; page?: number; limit?: number };
 
 export function listAdminRedeemBatches(params: AdminFinanceListParams = {}) {