Support "Webhook"

[quyendang]

I would like you to add a webhook integration feature that allows miner information to be sent periodically to a server, enabling users to monitor their Bitaxe miner remotely.

Please add an “Enable Webhook” option in the Settings section. When the webhook is enabled, users should be able to enter:

• The Webhook URL
• The interval between each miner status update

After a reset, the ESP32 should periodically send miner information to the webhook server using the HTTP POST method according to the configured interval.