同步上游 zip：合并任务后台化 + 合并整剧可直接播放；保留 ultrafast+4线程 转码优化与 .gitignore 本地规则

internal/webui/playback-settings.js

@@ -3,6 +3,13 @@ import { $, api, post } from './ui-core.js';
 export function createPlaybackSettings() {
   let settings = null;
   const fields = ['maxSessions', 'maxMediaRequests', 'maxRemuxJobs', 'maxAudioTranscodes', 'maxVideoTranscodes', 'maxPrefetchJobs', 'cacheMB'];
+  function updateDirect() {
+    const enabled = $('originalPlaybackEnabled').checked;
+    $('playbackDirectSources').querySelectorAll('input').forEach(input => {input.disabled = !enabled;});
+    $('playbackDirectHint').textContent = enabled
+      ? '允许尝试直连，不保证每集生效。需要服务器解密、转码，或源站鉴权、HTTPS、跨域检查未通过时仍走中转；客户端连接失败也会自动回退。'
+      : '原始 MP4 / HLS 播放已关闭，已勾选的直连站源也不会生效。先开启上方开关，再保存播放设置。';
+  }
   function render(result) {
     settings = result.settings;
     $('originalPlaybackEnabled').checked = settings.enabled;
@@ -18,6 +25,7 @@ export function createPlaybackSettings() {
       label.append(input, document.createTextNode(source.name));
       sources.appendChild(label);
     }
+    updateDirect();
   }
   async function load() {
     try {render(await api('/api/ui/admin/playback'));}
@@ -32,10 +40,10 @@ export function createPlaybackSettings() {
         directSources: [...$('playbackDirectSources').querySelectorAll('input:checked')].map(input => input.value)};
       for (const name of fields) value[name] = Number($('playback-' + name).value);
       render(await post('/api/ui/admin/playback', value));
-      $('playbackSettingsStatus').textContent = '播放设置已保存，新任务按当前限制执行。';
+      $('playbackSettingsStatus').textContent = '播放设置已保存，新任务按当前限制执行。' + (!value.enabled && value.directSources.length ? '原始播放已关闭，直连暂不生效。' : '');
     } catch (error) {$('playbackSettingsStatus').textContent = '保存失败：' + error.message;}
     finally {button.disabled = false;}
   }
-  function init() {$('savePlaybackSettings').onclick = save; return load();}
+  function init() {$('savePlaybackSettings').onclick = save; $('originalPlaybackEnabled').onchange = updateDirect; return load();}
   return {init};
 }