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Adds email and in-app notifications when user subscription tier changes: - Extended TemplateKey type with 'subscription_tier_change' - Added migration for tier change email template with HTML - Added sendTierChangeNotification() to NotificationsService - Integrated notifications into upgradeSubscription, downgradeSubscription, adminOverrideTier - Integrated notifications into grace-period.job.ts for auto-downgrades Notifications include previous tier, new tier, and reason for change. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>