alpha version: quit command hangs/timeouts on Windows 10 PRO

Can be tested with the playground here (node v24.19.0):

• nr dev at root (one terminal)
• pnpm nuxt dev (in another terminal)
• open / and navigate to /ws, then click ping button
• on playground terminal press q: the process awaits the default timeout (15s) and then logs:

[nitro-runtime] close: 0.054ms
◐  Cleaning up... press Ctrl-C again to exit immediately..
 WARN  force closing dev worker...                                                                                                                                                

◒  Cleaning up... press Ctrl-C again to exit immediately...function                                                                                                                 
│
▲  The dev server did not shut down within 15s: 80 file watchers, 1 worker thread, 1 open connection, 2 timers. Exiting anyway.
◇  Canceled                                                                           

I added a hack to show the opened connections adding the following code before calling summariseActiveResources at setupSignalHandlers in dev.ts:

        const handles = (process as any)._getActiveHandles?.()
        const networkHandles = handles.filter(h => (
          h.constructor.name === 'Socket'
          || h.constructor.name === 'Server'
        ))
        console.dir(networkHandles, { depth: 2 })
        const summary = summariseActiveResources()

Moving this.#websocketConnections.add(socket) before the if statement to allow #closeWebSocketConnections to close also these connections, the 1 open connection dissapear.

I'm working on fixing file watchers...

Reproduce the Windows 10 failure using the playground commands and websocket interaction described in the issue. Read packages/nuxt-cli/src/commands/dev.ts around setupSignalHandlers and packages/nuxt-cli/src/dev/utils.ts around websocket connection cleanup, then investigate the remaining file-watcher resources. Done means quitting no longer waits for the 15-second timeout or exits with active resources reported.