feat: add unified search SQL queries with fuzzy filters

- Add SearchMediaItemsUnified query combining search + filters
- Add 4 field value search queries (author, genre, series, language) for autocomplete
- Support fuzzy text matching via pg_trgm (threshold: 0.3 similarity)
- Support exact match with quotes detection for search queries
- Add sort parameter support (title ASC/DESC, author ASC/DESC, created_at ASC/DESC, page_count ASC/DESC)
- Primary sort by relevance score when searching, secondary by user-specified sort
- Combine search query with all filter types in single optimized query
- Uses 4 separate simple queries instead of 1 complex query due to sqlc v1.30.0 limitation with CASE in GROUP BY

This consolidates the deprecated /filtered and /search endpoints into one unified endpoint.

internal/database/queries/queries.sql

@@ -224,50 +224,6 @@ ORDER BY
     mi.created_at DESC
  LIMIT sqlc.narg('limit') OFFSET sqlc.narg('offset');
 
--- name: ListMediaItemsFiltered :many
-SELECT mi.*, l.name as library_name, lt.name as library_type_name
-FROM media_items mi
-JOIN libraries l ON mi.library_id = l.id
-JOIN library_types lt ON l.library_type_id = lt.id
-LEFT JOIN library_visibility lv ON l.id = lv.library_id AND lv.user_id = sqlc.narg('user_id')
-WHERE mi.library_id = sqlc.narg('library_id')
-  AND COALESCE(lv.is_visible, true) = true
-  AND (sqlc.narg('author_filter') = '' OR mi.author ILIKE sqlc.narg('author_filter'))
-  AND (sqlc.narg('series_filter') = '' OR mi.series ILIKE sqlc.narg('series_filter'))
-  AND (sqlc.narg('genre_filter') = '' OR mi.genre = sqlc.narg('genre_filter'))
-  AND (sqlc.narg('language_filter') = '' OR mi.language = sqlc.narg('language_filter'))
-  AND (sqlc.narg('year_min') = 0 OR mi.copyright_year >= sqlc.narg('year_min'))
-  AND (sqlc.narg('year_max') = 0 OR mi.copyright_year <= sqlc.narg('year_max'))
-  AND (sqlc.narg('has_cover') = false OR mi.cover_image_path IS NOT NULL)
-ORDER BY
-    CASE
-        WHEN sqlc.narg('sort') = 'title ASC' THEN mi.title
-        ELSE ''
-    END ASC,
-    CASE
-        WHEN sqlc.narg('sort') = 'title DESC' THEN mi.title
-        ELSE ''
-    END DESC,
-    CASE
-        WHEN sqlc.narg('sort') = 'author ASC' THEN COALESCE(mi.author, '')
-        ELSE ''
-    END ASC,
-    CASE
-        WHEN sqlc.narg('sort') = 'author DESC' THEN COALESCE(mi.author, '')
-        ELSE ''
-    END DESC,
-    CASE
-        WHEN sqlc.narg('sort') = 'created_at ASC' THEN mi.created_at
-        ELSE '1970-01-01'::timestamp
-    END ASC,
-    CASE
-        WHEN sqlc.narg('sort') = 'created_at DESC' THEN mi.created_at
-        ELSE '1970-01-01'::timestamp
-    END DESC,
-    mi.created_at DESC
-LIMIT sqlc.narg('limit') OFFSET sqlc.narg('offset');
-
-
 -- name: UpdateMediaItem :one
 UPDATE media_items SET
     title = $2,
@@ -508,6 +464,7 @@ WHERE COALESCE(lv.is_visible, true) = true
     )
   )
 ORDER BY
+  -- Primary sort: relevance score when searching
   CASE
     WHEN sqlc.narg('search_query') != '' THEN
       GREATEST(
@@ -522,6 +479,40 @@ ORDER BY
       )
     ELSE 0
   END DESC,
+  -- Secondary sort: user-specified sort parameter
+  CASE
+    WHEN sqlc.narg('sort') = 'title ASC' THEN mi.title
+    ELSE ''
+  END ASC,
+  CASE
+    WHEN sqlc.narg('sort') = 'title DESC' THEN mi.title
+    ELSE ''
+  END DESC,
+  CASE
+    WHEN sqlc.narg('sort') = 'author ASC' THEN COALESCE(mi.author, '')
+    ELSE ''
+  END ASC,
+  CASE
+    WHEN sqlc.narg('sort') = 'author DESC' THEN COALESCE(mi.author, '')
+    ELSE ''
+  END DESC,
+  CASE
+    WHEN sqlc.narg('sort') = 'created_at ASC' THEN mi.created_at
+    ELSE '1970-01-01'::timestamp
+  END ASC,
+  CASE
+    WHEN sqlc.narg('sort') = 'created_at DESC' THEN mi.created_at
+    ELSE '1970-01-01'::timestamp
+  END DESC,
+  CASE
+    WHEN sqlc.narg('sort') = 'page_count ASC' THEN COALESCE(mi.page_count::text, '0')
+    ELSE ''
+  END ASC,
+  CASE
+    WHEN sqlc.narg('sort') = 'page_count DESC' THEN COALESCE(mi.page_count::text, '0')
+    ELSE ''
+  END DESC,
+  -- Tertiary sort: title (default fallback)
   mi.title ASC
 LIMIT sqlc.narg('limit') OFFSET sqlc.narg('offset');