[BE-10] Implement credit/hour pack system with Paystack purchase flow

[inteee]

Summary\n\nImplements the credit/hour pack system for the co-working space, enabling users to purchase credit packs and use credits for services.\n\n## Changes\n\n### BE-10: Credit/Hour Pack System Backend\n- New CreditsModule with complete backend infrastructure\n- CreditPack, UserCredit, UserCreditTransaction entities with TypeORM\n- Providers: purchase-credits, get-credit-balance, get-credit-history, get-credit-packs\n- CreditsController with POST /credits/purchase, GET /credits/balance, GET /credits/history, GET /credits/packs\n- Paystack payment integration for purchasing credit packs\n- Payments module updated to handle credit transactions via webhook\n- CreditsModule registered in AppModule\n\n### Related Issues\n\nCloses #1166\nCloses #1167\nCloses #1168\nCloses #1169

[vercel]

@rmsb-art is attempting to deploy a commit to the naijabuz's projects Team on Vercel.

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[inteee]

Wrong fork — reopening under rmsb-art