Hardcoded production URL in NFC payload

[roshankumar0036singh]

Hardcoded production URL in NFC payload

tsconst payloadUrl = https://dev-card.vercel.app/${safeUsername}...
// Should be:
const payloadUrl = ${process.env.PUBLIC_APP_URL}/${safeUsername}...

NFC tags will always point to dev-card.vercel.app regardless of environment. This breaks NFC entirely in local dev, staging, and self-hosted deployments.

[roshankumar0036singh]

@Harxhit check this issue

[Harxhit]

@roshankumar0036singh I have assigned this issue to you.