feat(phase-9): email dispatcher — HTML templates, delivery log, test endpoint

Backend:
- app/models/email_log.py: EmailLog table (school_id, to, subject, type, status,
  error, sent_at) with EmailType + EmailStatus enums
- migrations/002_phase9_email_logs.py: Alembic migration for email_logs table
- app/templates/email/: 6 Jinja2 HTML templates — base layout, invoice,
  low_credit, license_expiry, overdue_warning, suspension
- app/services/email.py: enhanced send_email() — accepts template_name+context
  for HTML rendering, logs every attempt to email_logs, retries up to 3x on
  transient SMTP failure with exponential backoff
- app/routers/email.py: GET /api/email/logs (paginated, filterable by type/status/school),
  POST /api/email/test (send test email, super admin)
- tasks/billing.py: invoice + overdue warning + suspension emails now use HTML templates
- tasks/sms.py: low credit alert now uses HTML template
- tasks/license.py: expiry warning now uses HTML template
- app/main.py + migrations/env.py: wire in email_log model + email router

Frontend:
- EmailLogsPage.vue: table with to/subject/type badge/status badge/sent_at/error,
  type+status filters, pagination, Send Test Email modal
- router/index.ts: /email-logs route
- AppSidebar.vue: Email Logs nav item
- api.ts: getEmailLogs, sendTestEmail

.paul/STATE.md

@@ -3,16 +3,16 @@
 ## Current Position
 
 Milestone: v1.0 — Foundation & Core Services
-Phase: 8 of 15 (Billing Engine + Invoice PDF — complete)
-Plan: Phase 8 complete — Phase 9 next
-Status: **Phase 8 applied — ready to begin Phase 9**
-Last activity: 2026-03-16 — Phase 8 complete (invoice PDF via Jinja2+WeasyPrint, mark-paid modal, overdue escalation with 7d warning + 30d suspension, bug fix in billing task)
+Phase: 9 of 15 (Email Dispatcher — complete)
+Plan: Phase 9 complete — Phase 10 next
+Status: **Phase 9 applied — ready to begin Phase 10**
+Last activity: 2026-03-16 — Phase 9 complete (HTML email templates, email_logs table, enhanced send_email with template rendering + delivery logging + retries, email logs UI + test-email)
 
 ## Loop Position
 
 ```
 PLAN ──▶ APPLY ──▶ UNIFY
-  ·        ·        ·     [No active plan — Phase 9 planning next]
+  ·        ·        ·     [No active plan — Phase 10 planning next]
 ```
 
 ## Progress
@@ -27,7 +27,7 @@ PLAN ──▶ APPLY ──▶ UNIFY
 - Phase 6  (Super Admin Dashboard UI):       [██████████] 100% ✓
 - Phase 7  (School Admin Portal UI):         [██████████] 100% ✓
 - Phase 8  (Billing Engine + Invoice PDF):   [██████████] 100% ✓
-- Phase 9  (Email Dispatcher):               [░░░░░░░░░░]   0%
+- Phase 9  (Email Dispatcher):               [██████████] 100% ✓
 - Phase 10 (Support Ticket System):          [░░░░░░░░░░]   0%
 - Phase 11 (Monthly Report Generation):      [░░░░░░░░░░]   0%
 - Phase 12 (On-Prem Monthly Report Pull):    [░░░░░░░░░░]   0%
@@ -37,14 +37,14 @@ PLAN ──▶ APPLY ──▶ UNIFY
 
 ## Next Action
 
-Run: `/paul:plan` for Phase 9 — Email Dispatcher
-Resume file: .paul/ROADMAP.md → Phase 9
+Run: `/paul:plan` for Phase 10 — Support Ticket System
+Resume file: .paul/ROADMAP.md → Phase 10
 
 ## Repo
 
 Remote: TBD (new Gitea repo)
 Branch: master
-Last commit: feat(phase-8): billing engine + invoice PDF + mark-paid + overdue escalation
+Last commit: feat(phase-9): email dispatcher — HTML templates, delivery log, test endpoint
 
 ## Tech Stack