feat: support featured query parameter for events and projects

[mug1sha]

##What does this PR do?

This PR implements support for an optional ?featured=true query parameter on the GET /api/events and GET /api/projects endpoints. It allows clients to filter for only featured records,
which are sorted by date (events) or creation time (projects).

##Related issue

Closes # (Please insert the issue number here if applicable)

##How did you test it?

• Service Layer: Verified that Prisma queries correctly include the where: { featured: true } clause when the parameter is provided.
• Controller Layer: Confirmed that the query string is correctly parsed and passed to the service.
• Integration: Ran the existing test suite (npm test) to ensure no regressions in listing functionality.

##Checklist

• My code builds (npm run build)
• I added or updated tests and npm test passes
• I updated docs/openapi.yaml if I changed any routes (Filtering logic is an enhancement to existing list routes)
• I added a Prisma migration if I changed schema.prisma (N/A)
• I updated docs or .env.example if needed (Functionality is now available for frontend use)

[mug1sha]

support featured query parameter for events and projects @Nick-Lemy @rodriguecyber