Silo Browser Node v1 - Licensed Package

Purpose:
- Customer-facing browser node client
- Activates node license
- Stores node UID locally
- Sends pulse to SiloBlockchain API
- Supports controlled launch node onboarding

Activation API:
POST https://api.siloblockchain.com/api/node-license-activate.php

Pulse API:
POST https://api.siloblockchain.com/api/chain-node-pulse.php

Required:
license_key
node_uid

Optional:
user_ref
wallet_ref
