Verification API and QR Code Integration

[feyishola]

Location: backend/src/modules/verification/

📝 Description
Develop the certificate verification API that enables instant verification through QR codes, unique identifiers, and provides verification endpoints for third-party integration.

✅ Requirements

Create certificate verification endpoints with multiple input methods
Implement QR code generation and scanning functionality
Add verification API for third-party integrations
Support batch verification for institutional needs
Implement verification audit trail and logging
Add verification analytics and reporting
Create public verification widget for websites

✅ Acceptance Criteria

Verification process is fast and accurate
QR code integration works across different devices and platforms
API endpoints are secure and rate-limited appropriately
Verification logs maintain complete audit trails
Public verification tools are easy to integrate

🛠️ Please Note:
Create module in src/modules/verification/
Branch name: feat/verification-api
Commit message should include: close #issue number