- Database schema:
* subscription_plans table - stores plan tiers (Starter, Bronze, Silver, Gold)
* user_subscriptions table - assigns users to plans
* Default plans created (10, 50, 100, 250 credits/month)
* All existing users assigned to Starter plan
- Subscription service (subscription-service.ts):
* getAllPlans() - fetch all plans
* getActivePlans() - fetch active plans for users
* createPlan() - admin creates new plan
* updatePlan() - admin edits plan
* deletePlan() - admin removes plan
* getUserSubscription() - get user's current plan
* setUserPlan() - admin assigns user to plan
* grantMonthlyCredits() - distribute credits to all users
- Plan management interface (/admin/plans):
* Visual plan cards with credits, price, description
* Create/Edit/Delete plans
* Toggle active/inactive status
* Sort order management
* Grant monthly credits button (manual trigger)
- Features:
* Monthly credit allocation based on plan
* Prevents duplicate credit grants (tracks last_credit_grant_at)
* Admin can manually trigger monthly credit distribution
* Plans can be activated/deactivated
* Custom pricing and credit amounts per plan
- UI:
* Beautiful plan cards with color coding
* Modal for create/edit with validation
* Success/error messages
* Manage Plans button in admin dashboard
Ready for future automation (cron job for monthly credits)
and payment integration (Stripe/PayPal).
