变更摘要

本 PR 完成 Challenge05 的 MulCustom float32 逐元素乘法算子（z[i] = x[i] * y[i]），新增 mul_custom.asc 与 run.sh 两个文件。核心是实现了 KernelMul 的 Init、Process、CopyIn、Compute、CopyOut 全流程，使用 AscendC::Mul 完成计算，并配套 Host 侧 ACL 内存管理、Kernel 启动与结果校验逻辑。

主要改动

• 算子 Kernel 实现: 新增 mul_custom.asc，定义 MulCustomTilingData（含 totalLength、tileNum）与 KernelMul 类，实现 Init、Process、CopyIn、Compute、CopyOut，其中 Compute 通过 AscendC::Mul(zLocal, xLocal, yLocal, tileLength) 完成逐元素乘法，Process 按 tileNum * BUFFER_NUM 循环调度拷贝与计算。
• 数据切分与流水: Init 中按 AscendC::GetBlockNum()（8 核）切分 blockLength，并以 BUFFER_NUM = 2（Double Buffer）初始化 inQueueX、inQueueY、outQueueZ 三个队列，CopyIn/CopyOut 以 progress * tileLength 为偏移执行 DataCopy。
• Host 侧封装与启动: 新增 kernel_mul 函数，通过 ACL 接口（aclInit、aclrtMalloc、aclrtMemcpy、aclrtSynchronizeStream 等）完成设备内存分配、数据搬运、以 mul_custom<<<blockDim, nullptr, stream>>> 启动 Kernel（blockDim = 8、tileNum = 8）并将结果回拷；main 中构造 totalLength = 8 * 2048 的输入并调用 VerifyResult 与 golden 结果比对。
• 构建运行脚本: 新增 run.sh，通过 source "$ASCEND_TOOLKIT_HOME/set_env.sh" 激活 CANN 环境，并依次执行 cmake、make 及运行 ./mul_test，用于算子编译与运行验证。

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