feat: persist certificate verification analytics

[Tobiloba0]

Closes #878

Summary

• Add persisted certificate verification events for analytics
• Record verification attempts with only workspace, certificate id, public token id, and timestamp
• Aggregate total verifications from persisted events instead of returning a hard-coded zero
• Reuse CertificateAnalytics from CertificateService analytics
• Document privacy and retention considerations

Testing

• PASS: npx prisma validate
• PASS: npx prisma generate
• PASS: npx jest tests/certificate-analytics.test.ts tests/certificate-analytics.controller.test.ts --runInBand --forceExit
• PASS: npx prisma migrate diff --from-empty --to-schema prisma\schema.prisma --script

Notes

Full backend build/test currently fail on pre-existing unrelated Redis, storage queue, y-websocket, notification, and env config issues.

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[ayomideadeniran]

pr under review