refactor(音乐同步): 优化歌曲匹配逻辑，优先使用提供的songId

当songId存在时，跳过冗余的网易云匹配流程，直接使用songId进行精确匹配
如果精确匹配失败，再回退到基于名称的匹配方式

backend/src/handler/sync_jobs.js

@@ -93,21 +93,15 @@ async function createJob(req, res) {
         }
 
         if (songId) {
-            const songFromWyCloud = await findTheBestMatchFromWyCloud(req.account.uid, {
-                songName: meta.songName,
-                artist: meta.artist,
-                album: meta.album,
-                musicPlatformSongId: songId,
-            });
-            if (!songFromWyCloud) {
-                logger.error(`song not found in wycloud`);
-                res.status(412).send({
-                    status: 1,
-                    message: "can not find song in wycloud with your songId",
-                });
-                return;
-            }
-            meta.songFromWyCloud = songFromWyCloud;
+            // 直接传递songId给后续处理，避免冗余的网易云匹配
+            // 如果后续需要，可以根据songId进行精确匹配
+            meta.songFromWyCloud = {
+                songId: songId,
+                songName: meta.songName || "",
+                artist: meta.artist || "",
+                album: meta.album || "",
+            };
+            logger.info(`[sync_jobs] Using provided songId: ${songId}, will handle matching later if needed`);
         }
 
         // create job