#7 Issue 7: [Notification] SMS Alert System

[elizabetheonoja-art]

Description:
Send SMS for critical low balance (internet might be down, so SMS is better than Push).

Acceptance Criteria:

[ ] Twilio integration.

[ ] Logic: if balance < threshold && !alertSent.

[ ] "Your power will be cut in 1 hour. Top up now."

Priority: Medium
Labels: notification, mobile