Add support Webhook

[quyendang]

Allow periodically sending Bitaxe information to a webhook so that the Bitaxe miner’s status can be monitored remotely; this feature is intended for developers.

Change setting via Web UI

Enable Webhook via API

Use the following API request to enable the webhook feature and configure webhook settings on Bitaxe.

Endpoint

PATCH /api/system

Headers

Content-Type: application/json

Example Request

curl -X PATCH http://bitaxeip/api/system \
  -H "Content-Type: application/json" \
  -d '{
    "webhookEnabled": true,
    "webhookUrl": "http://webhook.com/bitaxe",
    "webhookInterval": 60
  }'

[mutatrum]

This should be possible without the code duplication. Maybe extract this code into a function that just creates the response json that's used both here as well in http_server?

[mutatrum]

Need code deduplication