Switch to dart-sass and make deploy script fail-safe

node-sass 4.x cannot build on arm64/Node 16. Use sass with ::v-deep
instead of /deep/, and only replace the server dist after the upload
is unpacked and verified.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/views/animationManage/subsetBatchUpdList/addMedia.vue

@@ -379,7 +379,7 @@ export default {
 
 <style lang="scss" scoped>
 .add-video-warp-box {
-  /deep/ .el-select--small {
+  ::v-deep .el-select--small {
     width: 250px !important;
   }
   .bottomBtn {