变更摘要

本 PR 主要解决纯 DSL 写的 attention 算子无法被自动发现的问题：此前普通 attention 与 experimental attention 的算子发现逻辑只检查算子根目录和 op_host 目录下的 CMakeLists.txt，仅提供 op_dsl/CMakeLists.txt 的算子会被跳过，需要额外补一个根目录转发文件。改动在 attention/CMakeLists.txt 与 experimental/attention/CMakeLists.txt 两处发现逻辑中引入第三个入口 op_dsl/CMakeLists.txt，并明确入口优先级，使纯 DSL 算子无需转发文件即可参与构建。

主要改动

• 新增 op_dsl 发现入口：在两处 attention 算子发现逻辑中加入 op_dsl/CMakeLists.txt，入口优先级依次为 <operator>/CMakeLists.txt、<operator>/op_host/CMakeLists.txt、<operator>/op_dsl/CMakeLists.txt。
• 保证单入口加载：每个算子只自动加载一个入口，已有 ASC 算子继续走原有入口，由其 op_host/CMakeLists.txt 自行 include DSL 适配，避免同一算子被重复加载。
• 纯 DSL 算子可直接接入：只有 op_dsl/CMakeLists.txt 的算子可被自动发现，并继续沿用现有的算子选择过滤规则，算子名称过滤行为不变。
• 改动范围收敛在 CMake 发现逻辑：仅调整 attention/CMakeLists.txt 和 experimental/attention/CMakeLists.txt，不包含算子示例，也不改动公共登记宏。

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