fix: 修复组合订阅中的单条订阅透传 User-Agent

backend/src/restful/sync.js

@@ -217,10 +217,12 @@ async function produceArtifact({
             subnames.map(async (name) => {
                 const sub = findByName(allSubs, name);
                 const passThroughUA = sub.passThroughUA;
+                let reqUA = sub.ua;
                 if (passThroughUA) {
                     $.info(
                         `订阅开启了透传 User-Agent, 使用请求的 User-Agent: ${ua}`,
                     );
+                    reqUA = ua;
                 }
                 try {
                     $.info(`正在处理子订阅：${sub.name}...`);
@@ -243,7 +245,7 @@ async function produceArtifact({
                                     try {
                                         return await download(
                                             url,
-                                            ua || sub.ua,
+                                            reqUA,
                                             undefined,
                                             proxy ||
                                                 sub.proxy ||