Update detection method and add helper functions

[oxmc]

Updated Raspberry Pi Detection & Added Helper Functions

This PR improves the Raspberry Pi detection reliability and adds useful helper functions for getting detailed system information.

Key Changes

1. Enhanced Detection Method:

   • Improved hardware detection by checking both /proc/cpuinfo fields
   • Added support for newer Pi models (including Pi 5 and Zero 2 W)
   • Added fallback checks when Hardware field is missing (Bookworm 64-bit)
   • Expanded list of known Pi hardware identifiers

2. New Helper Functions:

   • Added model() - Returns the full Pi model string
   • Added revision() - Returns the board revision code
   • Added info() - Returns structured detection results

   {
     isPi: boolean,
     model: string,
     hardware: string,
     revision: string
   }
   

Backward Compatibility

• Fully maintains existing API
• No breaking changes
• Same simple isPi() interface still works as before

Testing

Verified on:

• Raspberry Pi OS Bullseye (32-bit)
• Raspberry Pi OS Bookworm (64-bit)
• Pi models: 3B+, 4B, 5, Compute Model 4
• Non-Pi systems (negative testing)

Example Usage

const isPi = require('detect-rpi');

// Basic detection
console.log(isPi()); // true/false

// Get detailed info
const piInfo = isPi.info();
if (piInfo.isPi) {
  console.log(`Running on ${piInfo.model}`);
  console.log(`Hardware: ${piInfo.hardware}`);
  console.log(`Revision: ${piInfo.revision}`);
}