Backend (school_portal.py):
- GET /portal/sms-stats: 30/7/90-day chart, delivery rate, credit burn this month
- POST /portal/credits/request: auto-creates billing ticket for credit top-up
- GET /portal/overview: extended with days_left, sms_credit_low flag, 30-day SMS chart, full school details
PortalOverviewPage: suspension/expired banner, low-credit warning, credit meter
with progress bar, license countdown with expiry badge, 30-day SMS sparkline
PortalBillingPage: subscription plan panel (fee, SMS cost, cycle, next billing),
invoice table with subscription/SMS breakdown, credit top-up request form
PortalSmsPage: 30/7/90d period picker, 4-stat KPI row (sent, failed, delivery
rate, credit burn), daily volume chart, credit snapshot with top-up link,
paginated SMS log with status filter
PortalTicketsPage: status filter tabs (all/open/in-progress/resolved/closed),
pagination, improved empty states
PortalProfilePage: school details panel (name, city, contact, tier, status)
alongside existing change-password form
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