fix: 修复发布流水线 Windows arm64 CGO 工具链和 macOS 磁盘空间问题

- Windows arm64: 在 workflow matrix 中设置 CC=clang/CXX=clang++ 并注入构建环境
- macOS: 在 Makefile 关键节点清理中间产物和临时目录释放磁盘空间
- 预检步骤改用 $CC/$CXX 替代硬编码编译器名称，与 matrix 声明保持一致
- 同步新增 release-pipeline spec 需求: Windows arm64 CGO 编译器指定

.github/workflows/release.yml

@@ -156,12 +156,16 @@ jobs:
           - arch: amd64
             runner: windows-latest
             msystem: MINGW64
+            cc: gcc
+            cxx: g++
             packages: >-
               make
               mingw-w64-x86_64-gcc
           - arch: arm64
             runner: windows-11-arm
             msystem: CLANGARM64
+            cc: clang
+            cxx: clang++
             packages: >-
               make
               mingw-w64-clang-aarch64-clang
@@ -195,6 +199,9 @@ jobs:
 
       - name: Preflight Windows release toolchain
         shell: msys2 {0}
+        env:
+          CC: ${{ matrix.cc }}
+          CXX: ${{ matrix.cxx }}
         run: |
           set -euo pipefail
           command -v go
@@ -203,9 +210,11 @@ jobs:
           bun --version
           command -v make
           make --version
+          command -v "$CC"
+          "$CC" --version
+          command -v "$CXX"
+          "$CXX" --version
           if [ "${{ matrix.arch }}" = "arm64" ]; then
-            command -v clang
-            clang --version
             if command -v llvm-windres >/dev/null 2>&1; then
               llvm-windres --version
             else
@@ -213,8 +222,6 @@ jobs:
               windres --version
             fi
           else
-            command -v gcc
-            gcc --version
             command -v windres
             windres --version
           fi
@@ -228,6 +235,9 @@ jobs:
 
       - name: Build Windows release assets
         shell: msys2 {0}
+        env:
+          CC: ${{ matrix.cc }}
+          CXX: ${{ matrix.cxx }}
         run: make release-assets-windows
 
       - name: Upload Windows release assets