Billing Lifecycle and Subscription Controls

• reorganized billing service boundaries for maintainability
• added worker paths for webhook-driven subscription processing
• expanded integration test coverage around subscription lifecycle events

• subscription creation flow integrated into the application shell
• customer portal entry points for account-level billing updates
• structured billing information models for users and organizations

This release adds a complete subscription lifecycle foundation, helping teams launch paid plans with less custom billing logic.

• addressed edge cases in subscription state synchronization
• corrected billing portal redirect handling under uncommon conditions

• clearer billing status transitions in app flows
• better separation between billing orchestration and provider adapters
• improved resilience for retryable billing operations