Add component search index service

[Mbeaulne]

Tophatting

No manual tophatting required. This PR only adds the local search index service and unit tests.

What changed

Adds the local search index used by the new Components V2 page.

This is the plain text search layer. It turns hydrated component references into searchable entries and ranks matches by useful fields like name, description, inputs, outputs, and container command text.

Why

The UI needs fast search before any AI reranking happens. This keeps normal search instant and predictable.

Test plan

• Run pnpm exec vitest run src/services/componentSearchIndex.test.ts
• Run pnpm run typecheck --pretty false
• Sanity check that search ranks name matches above weaker matches like command-only matches

[github-actions]

🎩 Preview

A preview build has been created at: 05-27-component-search-index-service/d2b079d

[Mbeaulne]

• Add AI rerank and detail actions to Components V2 #2323
• Add multi-source Components V2 search and filters #2322
• Add Components V2 route shell #2319
• Add component search support utilities #2318
• Extract shared component detail view #2317
• Add natural-language component rerank service #2321
• Add Agent Settings UI for AI search #2320
• Add BYOK component search settings hook #2316
• Add component search index service #2315 👈 (View in Graphite)
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.