refactor(download): open generated links directly without the popup

The success modal added a second click between the download button and
the file: request -> "下载链接已生成" popup -> 立即下载. Drop it and open
the generated relay link right away, keeping the previous new-tab
behaviour; a missing link still surfaces the error view.

- Replace renderSuccess with startDownload (anchor + target=_blank)
- Remove the popup-only CSS: alert, code-row, copy button, chips, meta
  and the download action skin; error, cashier and scan-pay views keep
  their styles

assets/js/cms-download.js

@@ -4,7 +4,7 @@
  * 功能：
  *   - 监听 [data-action="aksrt-download"] 按钮点击
  *   - 调 POST /aksrt/v1/download/request
- *   - 弹窗显示下载链接（含提取码）
+ *   - 成功后直接打开生成的下载链接；失败/购买等场景仍走弹窗
  *
  * 弹窗视觉走主题 design token（见 assets/css/frontend/cms-download.css），
  * 付费收银台沿用参考实现的 colorful header 结构。
@@ -251,78 +251,21 @@
 		}
 	}
 
-	// ===== 成功渲染 =====
-	function renderSuccess(payload, returnFocusEl) {
-		payload = payload || {};
-		const code = String(payload.extract_code || '').trim();
-		const has = !!payload.has_extract || code !== '';
-		const safeCode = escapeHtml(code);
-		const safeCodeAttr = escapeAttr(code);
-		const expiresIn = typeof payload.expires_in === 'number' && payload.expires_in > 0
-			? Math.max(1, Math.round(payload.expires_in / 60))
-			: 10;
-
-		const hintMsg = '点击下方按钮开始下载，链接 ' + expiresIn + ' 分钟内有效。';
-
-		let body = '';
-		if (code !== '') {
-			body +=
-				'<div class="aksrt-dl-modal__code-card">' +
-				'  <div class="aksrt-dl-modal__code-caption">网盘提取码</div>' +
-				'  <div class="aksrt-dl-modal__code-row">' +
-				'    <code class="aksrt-dl-modal__code">' + safeCode + '</code>' +
-				'    <button type="button" class="aksrt-dl-modal__copy" data-copy="' + safeCodeAttr + '"><span class="aksrt-dl-modal__copy-text">复制</span></button>' +
-				'  </div>' +
-				'</div>' +
-				'<p class="aksrt-dl-modal__msg">' + escapeHtml(hintMsg) + '</p>';
-		} else if (has) {
-			body += '<p class="aksrt-dl-modal__alert aksrt-dl-modal__alert--warn">下载源标记了提取码，但接口未返回具体内容，请检查资源下载源的 extract_code 字段。</p>';
-		} else {
-			body += '<p class="aksrt-dl-modal__msg">' + escapeHtml(hintMsg) + '</p>';
+	// ===== 成功：直接打开生成的下载链接，不再弹窗 =====
+	function startDownload(payload, returnFocusEl) {
+		const url = payload && payload.dl_url ? String(payload.dl_url) : '';
+		if (!url) {
+			renderError('下载链接生成失败，请稍后重试', {}, returnFocusEl);
+			return;
 		}
-
-		const chips = [];
-		const sourceLabel = String(payload.source_label || '').trim();
-		if (sourceLabel !== '') {
-			chips.push('<span class="aksrt-dl-modal__chip"><i class="fa fas fa-box" aria-hidden="true"></i>' + escapeHtml(sourceLabel) + '</span>');
-		}
-		if (chips.length) {
-			body += '<div class="aksrt-dl-modal__meta">' + chips.join('') + '</div>';
-		}
-
-		open(
-			dlView('success', {
-				subtitle: '下载链接已生成，请及时将文件保存到本地。',
-				body: body,
-				actions: [{
-					kind: 'link',
-					url: payload.dl_url || '#',
-					label: '立即下载',
-					icon: 'fa-download',
-					cls: 'aksrt-dl-modal__download',
-					attrs: 'target="_blank" rel="noopener noreferrer"',
-				}],
-			}),
-			returnFocusEl
-		);
-
-		// 复制按钮
-		document.querySelectorAll('[data-copy]').forEach(function (btn) {
-			btn.addEventListener('click', function () {
-				const text = btn.getAttribute('data-copy') || '';
-				const label = btn.querySelector('.aksrt-dl-modal__copy-text') || btn;
-				if (navigator.clipboard) {
-					navigator.clipboard.writeText(text).then(function () {
-						label.textContent = '已复制';
-						btn.classList.add('is-done');
-						setTimeout(function () {
-							label.textContent = '复制';
-							btn.classList.remove('is-done');
-						}, 2000);
-					});
-				}
-			});
-		});
+		// 与旧版弹窗内「立即下载」一致：新标签页打开本站中转链接。
+		const link = document.createElement('a');
+		link.href = url;
+		link.target = '_blank';
+		link.rel = 'noopener noreferrer';
+		document.body.appendChild(link);
+		link.click();
+		link.remove();
 	}
 
 	// ===== 主流程 =====
@@ -403,7 +346,7 @@
 						renderError(r.json.message || '请稍后重试', r.json.data || {}, button, r.json.code);
 						return;
 					}
-				renderSuccess(r.json, button);
+				startDownload(r.json, button);
 			})
 				.catch(function () {
 					button.disabled = false;