fix(debugger): offer to install php-debug when it is missing (#1633)

php-debug had no entry in the missing-adapter table, so a PHP debug session without it failed with a plain error pointing at mason.nvim. It now offers Install and Debug like debugpy, Delve or js-debug, and the hint points to Settings › Languages & Frameworks › Language Servers.

Co-authored-by: Inf1mum <[email protected]>

src/platform/locales/text/zh.json

@@ -4123,6 +4123,7 @@
   "The JavaScript debugger (vscode-js-debug) is not installed": "JavaScript 调试器 (vscode-js-debug) 未安装",
   "Delve is not installed": "Delve 未安装",
   "CodeLLDB is not installed": "CodeLLDB 未安装",
+  "PHP Debug (Xdebug) is not installed": "PHP Debug (Xdebug) 未安装",
   "{name} (child)": "{name}（子进程）",
   "Enable breakpoint at {path}:{line}": "启用位于 {path}:{line} 的断点",
   "Headers ({count})": "标头 ({count})",