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Implement a new subscription-based billing model alongside existing metered/per-request billing: Backend: - Add subscription plan models (SubscriptionPlan, SubscriptionPlanItem, UserSubscription, etc.) - Implement CRUD APIs for subscription plan management (admin only) - Add user subscription queries with support for multiple active/expired subscriptions - Integrate payment gateways (Stripe, Creem, Epay) for subscription purchases - Implement pre-consume and post-consume billing logic for subscription quota tracking - Add billing preference settings (subscription_first, wallet_first, etc.) - Enhance usage logs with subscription deduction details Frontend - Admin: - Add subscription management page with table view and drawer-based edit form - Match UI/UX style with existing admin pages (redemption codes, users) - Support enabling/disabling plans, configuring payment IDs, and model quotas - Add user subscription binding modal in user management Frontend - Wallet: - Add subscription plans card with current subscription status display - Show all subscriptions (active and expired) with remaining days/usage percentage - Display purchasable plans with pricing cards following SaaS best practices - Extract purchase modal to separate component matching payment confirm modal style - Add skeleton loading states with active animation - Implement billing preference selector in card header - Handle payment gateway availability based on admin configuration Frontend - Usage Logs: - Display subscription deduction details in log entries - Show step-by-step breakdown of subscription usage (pre-consumed, delta, final, remaining) - Add subscription deduction tag for subscription-covered requests