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/composer.json

@@ -0,0 +1,14 @@
+{
+    "name": "ezscale/whmcs-migrate",
+    "description": "WHMCS to EZSCALE migration script",
+    "require": {
+        "php": "^8.3",
+        "vlucas/phpdotenv": "^5.6",
+        "monolog/monolog": "^3.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "WhmcsMigrate\\": "src/"
+        }
+    }
+}