Add comprehensive platform administration panel

- Database: Add login_history, ai_recommendation_log tables; is_platform_owner
  column on users; subscription fields on organizations (payment_date,
  confirmation_number, renewal_date)
- Backend: New AdminAnalyticsService with platform metrics, tenant detail, and
  health score calculations (0-100 based on activity, budget, transactions,
  members, AI usage)
- Backend: Login/org-switch now records to login_history; AI recommendations
  logged to ai_recommendation_log; platform owner protected from superadmin toggle
- Frontend: 4-tab admin panel (Dashboard, Organizations, Users, Tenant Health)
  with tenant detail drawer, subscription management, health scoring visualization
- Platform owner account (admin@hoaledgeriq.com) auto-redirects to admin panel
- Seed data includes platform owner account and sample login history

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -55,8 +55,14 @@ function SuperAdminRoute({ children }: { children: React.ReactNode }) {
 
 function AuthRoute({ children }: { children: React.ReactNode }) {
   const token = useAuthStore((s) => s.token);
+  const user = useAuthStore((s) => s.user);
   const currentOrg = useAuthStore((s) => s.currentOrg);
+  const organizations = useAuthStore((s) => s.organizations);
   if (token && currentOrg) return <Navigate to="/" replace />;
+  // Platform owner / superadmin with no org memberships → admin panel
+  if (token && user?.isSuperadmin && (!organizations || organizations.length === 0)) {
+    return <Navigate to="/admin" replace />;
+  }
   if (token && !currentOrg) return <Navigate to="/select-org" replace />;
   return <>{children}</>;
 }