feat(peers): prioritize mutual connections in PYMK algorithm

[trtajim]

Description

• Updates the 'You May Know' (relevant discovery) peer algorithm in PeerController to prioritize mutual connections (friends of friends).
• Uses institution/location matching and recent registrations as fallbacks when no mutual connections exist.
• Adds feature test in PeerTest.php to verify mutual connections ranking.

Summary by CodeRabbit

• New Features
  • “You May Know” recommendations now prioritize people with more mutual connections when using the default Relevant sorting.
  • Existing matching factors, including institution and location relevance, continue to influence the remaining results.
  • This ranking improvement applies to signed-in users, while guest recommendations continue using the existing relevance criteria.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2eeecf5 and 14122e2.

📒 Files selected for processing (2)

• app/Http/Controllers/PeerController.php
• tests/Feature/PeerTest.php

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