feat(sync_music): 添加同步歌曲时的详细日志记录

在sync_single_song_with_url.js中添加详细的日志记录，包括开始同步时的参数、TuneHub参数解析结果、下载URL以及歌曲信息获取状态。这有助于调试和追踪同步过程中的问题。

backend/src/service/sync_music/sync_single_song_with_url.js

@@ -101,26 +101,38 @@ module.exports = async function syncSingleSongWithUrl(uid, url, {
     album = "",
     songFromWyCloud = null
 } = {}, jobId = 0, jobType = JobType.SyncSongFromUrl, playlistName = "", collectRet) {
+    logger.info(`[syncSingleSongWithUrl] ===== Start =====`);
+    logger.info(`[syncSingleSongWithUrl] uid=${uid}, url=${url}, songName=${songName}, artist=${artist}, album=${album}`);
+    logger.info(`[syncSingleSongWithUrl] jobId=${jobId}, jobType=${jobType}`);
+
     // step 1. fetch song info
     let songInfo = null;
     let downloadUrl = url;
     let useTunehubDownload = false;
     const tunehubParams = parseTunehubParams(url) || parsePageUrlParams(url);
+    logger.info(`[syncSingleSongWithUrl] tunehubParams=${JSON.stringify(tunehubParams)}`);
+
     if (tunehubParams) {
+        logger.info(`[syncSingleSongWithUrl] Using TuneHub for ${tunehubParams.source}:${tunehubParams.id}`);
         useTunehubDownload = true;
         downloadUrl = buildSongUrl(tunehubParams.source, tunehubParams.id);
+        logger.info(`[syncSingleSongWithUrl] downloadUrl=${downloadUrl}`);
         const tunehubInfo = await getSongInfo(tunehubParams.source, tunehubParams.id);
         if (tunehubInfo) {
             songInfo = buildSongInfoFromTunehub(tunehubParams.source, tunehubInfo);
+            logger.info(`[syncSingleSongWithUrl] TuneHub success: ${songInfo.songName} - ${songInfo.artist}`);
         } else if (tunehubParams.source === 'netease') {
             const wyInfo = await getWySongInfo(uid, tunehubParams.id);
             if (wyInfo) {
                 songInfo = buildSongInfoFromWyCloud(wyInfo);
+                logger.info(`[syncSingleSongWithUrl] WyCloud success: ${songInfo.songName} - ${songInfo.artist}`);
             }
         }
     }
     if (!songInfo) {
         if (!tunehubParams) {
+            logger.error(`[syncSingleSongWithUrl] ERROR: URL not recognized, cannot parse params. url=${url}`);
+            logger.info(`[syncSingleSongWithUrl] Will call getMetaWithUrl (deprecated - may fail with media-get)`);
             songInfo = await getMetaWithUrl(url);
             logger.info(songInfo);
             if (songInfo === false || songInfo.isTrial) {
@@ -128,6 +140,7 @@ module.exports = async function syncSingleSongWithUrl(uid, url, {
                 return false;
             }
         } else {
+            logger.info(`[syncSingleSongWithUrl] TuneHub failed, using fallback with provided metadata`);
             songInfo = buildFallbackSongInfo({
                 songName,
                 artist,