kevin-asprec 0e0803e417 feat(phase-8): billing engine + invoice PDF + mark-paid + overdue escalation ...

Backend:
- app/services/invoice_pdf.py: Jinja2+WeasyPrint PDF generation, saves to
  /app/data/invoices/{id}.pdf, updates Invoice.pdf_path
- app/templates/invoice.html: professional branded A4 invoice template with
  school details, line items table, totals, payment instructions, paid receipt
- routers/billing.py: GET /invoices/{id}/pdf (auto-generate on demand, FileResponse),
  POST /invoices/{id}/mark-paid (payment_method + reference → status=paid),
  POST /trigger-generate-invoices (manual trigger), school_name in invoice list
- tasks/billing.py: fix missing func import in generate_monthly_invoices,
  new billing.generate_invoice_pdf Celery task, auto-send email after
  invoice creation, check_overdue upgraded with 7-day warning emails and
  30-day school suspension + suspension email

Frontend:
- BillingPage.vue: full rewrite — status filter tabs, school names (not UUIDs),
  PDF download button, mail icon, Mark Paid modal with method/reference fields,
  overdue rows highlighted, pagination, Generate Invoices trigger button
- api.ts: markInvoicePaid, downloadInvoicePdf, triggerGenerateInvoices

2026-03-16 13:46:33 +08:00

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