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/videoManagement/emojiList/index.vue

@@ -746,10 +746,10 @@ export default {
   -webkit-transform: translate(-50%);
   transform: translate(-50%);
 }
-/deep/ .el-form-item__content {
+::v-deep .el-form-item__content {
   display: flex;
 }
-/deep/ .el-select {
+::v-deep .el-select {
   width: 100%;
 }
 .avatar-uploader .el-upload {