@GetMapping("/id/{id}")
    public ShenyuAdminResult queryById(@PathVariable("id") @Valid
                                        @Existed(provider = TagMapper.class,
                                                message = "tag is not existed") final String id) {
        TagVO tagVO = tagService.findById(id);
        return ShenyuAdminResult.success(ShenyuResultMessage.DETAIL_SUCCESS, tagVO);
    }
detail tag.

@param id tag name.
@return {@linkplain ShenyuAdminResult}
shenyu-admin/src/main/java/org/apache/shenyu/admin/controller/TagController.java