docs: consolidate implementation plans into unified search document
- Remove GET_SAVED_FILTER_BY_ID_IMPLEMENTATION.md (superseded) - Remove SAVED_FILTERS_IMPLEMENTATION.md (superseded) - Add UNIFIED_SEARCH_IMPLEMENTATION.md with comprehensive plan for: - Consolidating /filtered and /search endpoints - All-fuzzy text filters (author, series, genre, language) - Exact match with quotes for Google-style search - Field-specific fuzzy search for autocomplete dropdowns - Combined search + filters functionality - Phase-by-phase implementation with SQL, service, handler, frontend, tests, docs
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