Feat/mainnet

[Huygon764]

Add config for horizenMainnet and CI/CD for prod and staging

Types of change

• Feature
• Bug
• Enhancement

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1. Horizen Mainnet Config

TODO (Mainnet not working yet)

• Set DOMAIN_ID_HORIZEN_MAINNET
• Set zkVerifyAddress for mainnet

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2. CI/CD for Staging and Production

2.1 Workflow Files

File	Branch	Environment	Deploy Target
backend-prod.yml	main	prod	polypay-backend
backend-staging.yml	develop	staging	polypay-backend-staging
frontend-prod.yml	main	prod	polypay-frontend
frontend-staging.yml	develop	staging	polypay-frontend-staging

2.2 Added Environment Variables

Staging Environment

Variable	Value
NEXT_PUBLIC_NETWORK	testnet
NETWORK	testnet

Production Environment

Variable	Value
NEXT_PUBLIC_NETWORK	mainnet
NETWORK	mainnet

2.4 Flow

develop branch → Build → Push Image → Deploy to Staging (testnet) 
        ↓
main branch → Build → Push Image → Deploy to Production (mainnet)