feat(billing): plan taxonomy reconciliation + Stripe sync + internal-tester allowlist (#164)

Co-authored-by: Michael Chihlas <michael@resolutionflow.com>
Co-committed-by: Michael Chihlas <michael@resolutionflow.com>

frontend/src/components/common/PageMeta.tsx

@@ -8,6 +8,7 @@ interface PageMetaProps {
 }
 
 const SITE_NAME = 'ResolutionFlow'
+const DEFAULT_TAGLINE = 'AI-Powered Troubleshooting for MSPs'
 const DEFAULT_DESCRIPTION = 'Transform troubleshooting into guided workflows with automatic documentation'
 
 /**
@@ -20,7 +21,7 @@ export function PageMeta({
   ogImage,
   ogType = 'website',
 }: PageMetaProps) {
-  const fullTitle = title ? `${title} | ${SITE_NAME}` : `${SITE_NAME} - Decision Tree Platform`
+  const fullTitle = title ? `${title} | ${SITE_NAME}` : `${SITE_NAME} — ${DEFAULT_TAGLINE}`
 
   return (
     <Helmet>

frontend/src/components/subscription/CheckoutButton.tsx

@@ -1,12 +1,12 @@
 import { cn } from '@/lib/utils'
 
 interface CheckoutButtonProps {
-  plan: 'pro' | 'team'
+  plan: 'starter' | 'pro' | 'enterprise'
   className?: string
 }
 
 export function CheckoutButton({ plan, className }: CheckoutButtonProps) {
-  const planLabels = { pro: 'Pro', team: 'Team' }
+  const planLabels = { starter: 'Starter', pro: 'Pro', enterprise: 'Enterprise' }
 
   return (
     <button