feat: implement token allowances, walletconnect v2, payment retry, and secrets management

[Dev-sandy1]

Summary

This PR implements four major features across the backend and frontend:

1. Token Allowances Management Dashboard (#269)

• Backend: New /api/v1/allowances endpoint with support for:

  • Fetching token allowances from chain
  • Approval/revocation interface
  • Risk indicators for unlimited allowances
  • Batch revocation
  • Historical approvals log
  • Gas estimation for changes
  • Recommended allowance amounts

• Frontend: New dashboard page at /dashboard/allowances with:

  • Table view of all allowances with risk indicators
  • Approval and revocation modals
  • Batch selection and revocation
  • Approval history tab
  • Summary cards showing total allowances and risk levels

2. WalletConnect v2 Integration (#265)

• Frontend: New wallet-connect library with:
  • Web3Modal integration for WalletConnect v2
  • Multi-chain namespace support (eip155)
  • Session persistence
  • QR code generation support
  • Deep link handling
  • Chain switching functionality
  • Session expiry handling

3. Automatic Payment Retry with Exponential Backoff (#261)

• Backend: New retry service with:

  • Configurable retry configuration per payment type
  • Exponential backoff algorithm
  • Max retry limits
  • Transient error detection
  • Failure notifications
  • Manual retry override
  • Retry analytics
  • Circuit breaker on repeated failures

• New endpoints:

  • /api/v1/retry/config - Manage retry configurations
  • /api/v1/retry/status - Check payment retry status
  • /api/v1/retry/analytics - View retry statistics

4. Secrets Management with HashiCorp Vault (#259)

• Backend: New vault service with:

  • Vault integration setup
  • Database credentials in Vault
  • API keys in Vault
  • Automatic rotation
  • Lease management
  • Secrets injection
  • Emergency access procedures

• New endpoints:

  • /api/v1/secrets - Secret management CRUD
  • /api/v1/secrets/database/credentials/:role - Dynamic database credentials

Test Plan

• Test allowances API endpoints
• Test payment retry functionality
• Verify Vault integration (when Vault is available)
• Test wallet connection flow

Notes

• All new features include mock data for development/testing
• Environment variables can be used as fallback for secrets
• Circuit breaker prevents retry storms on persistent failures

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

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[Smartdevs17]

⚠️ Merge conflicts detected

Hi @Dev-sandy1,

This PR has merge conflicts that must be resolved before it can be merged.

To fix:

1. Sync with the latest main branch: git fetch origin && git merge origin/main
2. Resolve the conflicts in your code
3. Push the resolved changes

Once resolved, the PR will be automatically merged on the next run.

---

🤖 Drips Wave Review Agent

[Smartdevs17]

⚠️ Merge conflicts detected

Hi @Dev-sandy1,

This PR has merge conflicts that must be resolved before it can be merged.

To fix:

1. Sync with the latest main branch: git fetch origin && git merge origin/main
2. Resolve the conflicts in your code
3. Push the resolved changes

Once resolved, the PR will be automatically merged on the next run.

---

🤖 Drips Wave Review Agent

[Smartdevs17]

⚠️ Merge conflicts detected

Hi @Dev-sandy1,

This PR has merge conflicts that must be resolved before it can be merged.

To fix:

1. Sync with the latest main branch: git fetch origin && git merge origin/main
2. Resolve the conflicts in your code
3. Push the resolved changes

Once resolved, the PR will be automatically merged on the next run.

---

🤖 Drips Wave Review Agent