2.2.1

Hardening release from a code audit — includes a likes-counter fix that matters on non-MySQL databases.

Changes

• Cross-database likes counter: the discussions.likes_count sync no longer uses MySQL-only CAST(... AS SIGNED) raw SQL. It now uses Eloquent's atomic increment()/decrement(), so it works on PostgreSQL and SQLite too (previously a like on those engines threw and left the count permanently stale). Floored at 0.
• Like/unlike listeners are container-resolved (Class@method) — no manual resolve() per event.
• The hero "newest member" field is cached for 5 minutes like the scoreboard counts, so it no longer adds a DB round-trip to every page load; the two ForumResource extenders are merged.
• Live-scores controller injects its Guzzle client instead of constructing one per request.
• Removed an unconditional ini_set('memory_limit') that ran on every web request (it's a CLI/build concern).
• The composer trigger opens the composer via the core component loader instead of a hard-coded .IndexPage-newDiscussion DOM node.
• Removed two unused locale keys.

Safe to update — no migrations.