fix: parse launch.json as jsonc

[Albro3459]

Summary

• parse .vscode/launch.json as JSONC with jsonc-parser instead of stripping comments with a regex
• preserve strings that contain //, such as serverReadyAction.pattern values with URLs
• add the parser dependency and update the related lockfiles

Reproduce

Current main can fail to parse a valid VS Code launch.json like this:

{
  // VS Code accepts comments in launch.json
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Debug App",
      "type": "pwa-node",
      "request": "launch",
      "serverReadyAction": {
        "pattern": "Local:.*(https?://localhost:\\d+)",
        "action": "startDebugging",
        "name": "Launch Chrome"
      }
    }
  ]
}

The previous implementation removes comments with a regex before calling JSON.parse. That also strips the // inside https?://..., corrupts the string, and causes get_debugger_configurations to reject a file that VS Code itself accepts.

Validation

• ran npm run build in mcp-server
• set VSCODE_WORKSPACE_PATH to a workspace containing serverReadyAction.pattern: "Local:.*(https?://localhost:\\d+)"
• invoked the built getDebuggerConfigurationsTool
• confirmed the updated parser returns status: "success" and the expected configurations for that launch.json
• reran the same check on main and reproduced the existing parse failure from the old regex-based parser