feat: implement payment retry with exponential backoff and vault secrets management

[Dev-sandy1]

Summary

• Implements automatic payment retry with exponential backoff for failed transactions (Core: Implement Automatic Payment Retry with Exponential Backoff #261)
• Implements secrets management using HashiCorp Vault for API keys, database credentials, and cryptographic keys (Security: Implement Secrets Management with HashiCorp Vault #259)
• Implements WalletConnect v2 integration with multi-chain support (Core: Implement WalletConnect v2 Integration with Multi-Chain Support #265)
• Implements token allowances management dashboard with approval/revocation interface (Core: Implement Token Allowances Management Dashboard #269)

Closes #261
Closes #259
Closes #265
Closes #269

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