Detect my project's dev servers and save all their configurations to .claude/launch.json, then ask which ones to start.
```json
{
"version": "0.0.1",
"configurations": [
{
"name": "",
"runtimeExecutable": "",
"runtimeArgs": [""],
"port":
}
]
}
```
Use runtimeExecutable for the command (e.g. "yarn", "npm", "node", "python") and runtimeArgs for its arguments. Call preview_start for each server the user wants to run.
