Add global search across all hackweek years

[sentry-junior]

Project and idea search is scoped to a single year. Finding an older project means guessing which year it was in and searching each archive separately.

Current behavior

• Search lives on the per-year projects page (/years/:yearId) and is wired through year-scoped queries (src/app/routes/ProjectsPage.tsx, src/app/queries/projects.ts)
• Backend listing requires yearId and filters with p.year_id = ? before applying the q name/summary match (src/worker/repositories/projects.ts)

Gap

• There is no cross-year search, so looking up a past project to share or link requires checking multiple year archives

Impact

• Slows down common “find that old hackweek project” lookups across the multi-year archive

Requested by michael.

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View Junior Session [Sentry]