- Created FullTextSearchService using PostgreSQL tsvector/tsquery
- Supports full-text search for tracks, users, and playlists
- Uses GIN indexes from migration 048_search_indexes.sql
- Features relevance scoring with ts_rank_cd
- Weighted search (title/name weighted higher than description)
- Pagination and minimum relevance score filtering
- Unified search across all types and individual search methods
- Added unit tests for service validation and query preparation
