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* feat: add proration invoice and reminder email templates Add email templates for monthly proration billing notifications: - ProrationInvoiceEmail: Sent when invoice is created for additional seats - ProrationReminderEmail: Sent 7 days later if invoice remains unpaid Includes: - React email templates using V2BaseEmailHtml - BaseEmail classes for rendering - Billing email service functions - Translation keys for email content Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * fix: use allSettled --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>