refactor: Makefile 命名规范化，新增顶层便捷命令

统一命名规范为 <namespace>-<action>[-<variant>] 格式：
- 重命名 desktop-mac/win/linux → desktop-build-mac/win/linux
- 重命名 backend-migrate-* → backend-db-*
- 重命名 frontend-build-desktop → desktop-prepare-frontend
- 重命名 embedfs-prepare → desktop-prepare-embedfs
- 重命名 package-macos → desktop-package-mac

新增顶层便捷命令：
- dev: 并行启动开发环境
- build: 构建所有产物
- test: 运行所有测试
- lint: 检查所有代码
- clean: 清理所有构建产物

go.work.sum

@@ -35,6 +35,7 @@ github.com/google/s2a-go v0.1.9/go.mod h1:YA0Ei2ZQL3acow2O62kdp9UlnvMmU7kA6Eutn0
 github.com/googleapis/enterprise-certificate-proxy v0.3.4/go.mod h1:YKe7cfqYXjKGpGvmSg28/fFvhNzinZQm8DGnaburhGA=
 github.com/googleapis/gax-go/v2 v2.14.1/go.mod h1:Hb/NubMaVM88SrNkvl8X/o8XWwDJEPqouaLeN2IUxoA=
 github.com/gookit/color v1.5.4/go.mod h1:pZJOeOS8DM43rXbp4AZo1n9zCU2qjpcRko0b6/QJi9w=
+github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+dAcgU=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
 github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=