feat: complete pre-launch audit — frontend polish, churn prevention, login history, financial reports, configurable checkout

Includes all work from phases 6-9+ and frontend polish rounds 1 & 2:

- Login history with device trust, new device notifications, session management
- Churn prevention: cancellation surveys, winback campaigns with email sequences
- Financial reports: revenue, P&L, tax, aging, refund, subscription reports with PDF/CSV/JSON export
- Configurable checkout: plan config groups/options, build-your-own VPS
- Frontend polish: fix broken legal links, add SEO meta tags, favicon, font display=swap,
  Head titles on all 14 marketing pages, mobile responsive fixes, AuthLayout legal footer,
  remove false 24/7 claims, hide empty stats, correct uptime SLA to 99.9%,
  GameServers notify buttons linked to /contact, 301 redirects for /terms and /privacy
- WHMCS migration scripts
- Update legal page effective dates to March 16, 2026

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/whmcs-migrate/.env.example

@@ -0,0 +1,15 @@
+WHMCS_API_URL=https://account.ezscale.cloud/includes/api.php
+WHMCS_API_IDENTIFIER=
+WHMCS_API_SECRET=
+
+EZSCALE_DB_HOST=127.0.0.1
+EZSCALE_DB_PORT=3306
+EZSCALE_DB_DATABASE=ezscale_billing
+EZSCALE_DB_USERNAME=ezscale
+EZSCALE_DB_PASSWORD=
+
+LARAVEL_APP_KEY=
+
+DRY_RUN=false
+BATCH_SIZE=250
+LOG_LEVEL=info