H-05: Vendor Trust Score & Public Leaderboard

[jpdevhub]

The Idea

Let's build a community-powered trust system. By aggregating anonymous scan scores from specific markets, we can give vendors a public "Trust Score". Think of it like Google Reviews for fish freshness!

What needs to be done

• Backend: Calculate and store aggregated freshness scores per vendor.
• Create a new endpoint /api/v1/vendors/{id}/trust-score.
• Frontend: Build a public leaderboard page showing ranks, trust badges, and trends.

This feature takes the app from a simple scanner to a full platform.

[Aharshi3614]

Hi! I would like to work on this issue. Can I be assigned?
I have experience designing and implementing backend APIs, aggregation logic, and data-driven features. I've worked on calculating and storing aggregated metrics, building REST endpoints, and creating frontend dashboards/leaderboards with ranking and trend visualizations.

For this task, I can handle:

Backend aggregation and trust score calculation logic
Database design/storage for vendor scores and trends
Building the /api/v1/vendors/{id}/trust-score endpoint
Frontend leaderboard UI with rankings, badges, and trend indicators
Testing and performance considerations for score updates