feat: Implement credit system

[ngoiyaeric]

This commit introduces a new credit system to the SaaS starter.

The credit system allows you to track and limit usage of premium features based on subscription plans.

Key features:

• Automatic credit granting based on Stripe subscription plans.
• Usage tracking through Stripe Billing Meters.
• Real-time credit balance and usage information.
• UI components for credit management.
• API endpoints for credit operations.
• Comprehensive logging of credit grants and usage.

The implementation includes:

• A new credit-service.ts to handle the business logic of the credit system.
• Updates to the database schema to include credit-related fields.
• A new Stripe webhook handler to grant credits on subscription payments.
• New API routes for credit management.
• New React components for displaying credit information.
• Example of how to protect API routes and frontend components with credit checks.
• Documentation for testing and deployment.

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[brrock]

Completely vibed!!?

[brrock]

Does it even work?

[ngoiyaeric]

No but I will have to get it working. Do you want to collaborate?

[brrock]

If I were you I would use redis