fix(cpp): explain missing clang-tidy checks with Apple's clangd (#770)

Apple's clangd (/usr/bin/clangd, Xcode and CommandLineTools toolchains) is built without clang-tidy, so on a Mac without a managed clangd the checks from .clang-tidy never appear. When a clangd server for C, C++, Objective-C or Objective-C++ resolves to Apple's binary and the project has a .clang-tidy, show one warning per session with Install (managed LLVM clangd, which already takes precedence once installed) and Language Servers… actions. Fixes #692.

src/platform/locales/text/zh.json

@@ -1,4 +1,5 @@
 {
+  "Apple's clangd does not run clang-tidy, so checks from .clang-tidy are not shown. Install clangd (LLVM) to get them.": "Apple 的 clangd 不运行 clang-tidy，因此不会显示 .clang-tidy 中配置的检查。请安装 clangd（LLVM）以启用这些检查。",
   "Newer dependency version available": "有更新的依赖版本可用",
   "Reports newer crate versions that Cargo.toml requirements do not already allow.": "报告 Cargo.toml 版本要求尚未允许的较新 crate 版本。",
   "Update to {latest}": "更新至 {latest}",