Add Elasticsearch as optional search backend#230
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…adation to pg_trgm Adds a search facade that routes library catalog queries to Elasticsearch when ELASTICSEARCH_URL is set, falling back to PostgreSQL pg_trgm on any ES error or when the env var is unset. This enables Lucene-powered fuzzy matching, stemming, and relevance ranking while preserving the existing pg_trgm behavior as the default. New files: ES client singleton, index mapping/lifecycle, ES search implementations (searchLibraryES, findSimilarArtistES, searchAlbumsByTitleES, searchByArtistES), sync stubs (PR 2), and the search facade. Renames pg_trgm functions with pgTrgm prefix and re-exports facade versions under the original names so no callers need to change imports. Also adds: Docker Compose ES services (dev + ci profiles), expanded /healthcheck with ES status, unit tests for client, search, and facade, updated CLAUDE.md and .env.example.
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Summary
apps/backend/services/search/) that routes to ES whenELASTICSEARCH_URLis set, falls back to pg_trgm on any errorpgTrgmprefix and re-exports facade versions under the original names (no callers need to change)/healthcheckto report ES status (connected,unavailable, ordisabled)Closes #229
Test plan
npm run test:unit-- all 266 tests pass (21 suites)npm run typecheck-- no type errorsnpm run lint-- 0 errors (143 pre-existing warnings)npm run devstarts normally, search works via pg_trgm, healthcheck showselasticsearch: "disabled"ELASTICSEARCH_URL=http://localhost:9200, run ES container, healthcheck showselasticsearch: "connected"