feat: add tags_search and contributors_search fields to database

Schema changes:
- Add tags_search TEXT[] column for case-insensitive, punctuation-free search
- Add contributors_search TEXT[] column for case-insensitive, punctuation-free search
- Create GIN indexes for fast array searches on both search fields

Query updates:
- CreateMediaItem: Include tags_search and contributors_search parameters
- UpdateMediaItem: Include tags_search and contributors_search parameters
- SearchMediaItems: Search against tags_search instead of tags
- SearchMediaItems: Search against contributors_search instead of contributors
- SearchMediaItemsFuzzy: Use tags_search and contributors_search for fuzzy matching
- Update ranking and priority logic to use search fields

Benefits:
- Case-insensitive search: "acme corp" finds "ACME CORP."
- Punctuation-agnostic search: "oreilly" finds "O'Reilly Media"
- Better UX: Users don't need to match exact casing or punctuation
- Improved performance with dedicated GIN indexes

Relates to Tags & Contributors Migration Phases 5 & 8

internal/database/queries/queries.sql

@@ -102,8 +102,8 @@ ORDER BY l.created_at DESC;
 
 -- Media Items queries
 -- name: CreateMediaItem :one
-INSERT INTO media_items (library_id, title, author, isbn, description, file_path, file_size, mime_type, cover_image_path, series, series_number, tags, asin, date_published, publisher, contributors, language, edition, page_count, genre, copyright_year, goodreads_id, openlibrary_id, google_books_id, added_by_admin_id)
-VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25)
+INSERT INTO media_items (library_id, title, author, isbn, description, file_path, file_size, mime_type, cover_image_path, series, series_number, tags, tags_search, asin, date_published, publisher, contributors, contributors_search, language, edition, page_count, genre, copyright_year, goodreads_id, openlibrary_id, google_books_id, added_by_admin_id)
+VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27)
 RETURNING *;
 
 -- name: GetMediaItem :one
@@ -252,18 +252,20 @@ UPDATE media_items SET
     series = $7,
     series_number = $8,
     tags = $9,
-    asin = $10,
-    date_published = $11,
-    publisher = $12,
-    contributors = $13,
-    language = $14,
-    edition = $15,
-    page_count = $16,
-    genre = $17,
-    copyright_year = $18,
-    goodreads_id = $19,
-    openlibrary_id = $20,
-    google_books_id = $21,
+    tags_search = $10,
+    asin = $11,
+    date_published = $12,
+    publisher = $13,
+    contributors = $14,
+    contributors_search = $15,
+    language = $16,
+    edition = $17,
+    page_count = $18,
+    genre = $19,
+    copyright_year = $20,
+    goodreads_id = $21,
+    openlibrary_id = $22,
+    google_books_id = $23,
     updated_at = NOW()
 WHERE id = $1
 RETURNING *;
@@ -359,22 +361,22 @@ 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 COALESCE(lv.is_visible, true) = true
-  AND (
-      mi.title ILIKE sqlc.narg('search_pattern') OR 
-      mi.author ILIKE sqlc.narg('search_pattern') OR 
-       mi.series ILIKE sqlc.narg('search_pattern') OR
-       sqlc.narg('search_pattern') = ANY(mi.tags) OR
-       sqlc.narg('search_pattern') = ANY(mi.contributors)
-  )
-ORDER BY 
-   CASE
-      WHEN mi.title ILIKE sqlc.narg('search_pattern') THEN 1
-      WHEN mi.author ILIKE sqlc.narg('search_pattern') THEN 2
-      WHEN mi.series ILIKE sqlc.narg('search_pattern') THEN 3
-      WHEN sqlc.narg('search_pattern') = ANY(mi.tags) THEN 4
-      ELSE 5
-  END,
+ WHERE COALESCE(lv.is_visible, true) = true
+   AND (
+       mi.title ILIKE sqlc.narg('search_pattern') OR
+       mi.author ILIKE sqlc.narg('search_pattern') OR
+        mi.series ILIKE sqlc.narg('search_pattern') OR
+        sqlc.narg('search_pattern') = ANY(mi.tags_search) OR
+        sqlc.narg('search_pattern') = ANY(mi.contributors_search)
+   )
+ ORDER BY
+    CASE
+       WHEN mi.title ILIKE sqlc.narg('search_pattern') THEN 1
+       WHEN mi.author ILIKE sqlc.narg('search_pattern') THEN 2
+       WHEN mi.series ILIKE sqlc.narg('search_pattern') THEN 3
+       WHEN sqlc.narg('search_pattern') = ANY(mi.tags_search) THEN 4
+       ELSE 5
+   END,
   mi.title ASC
 LIMIT sqlc.narg('limit') OFFSET sqlc.narg('offset');
 
@@ -390,12 +392,12 @@ WHERE COALESCE(lv.is_visible, true) = true
        word_similarity(sqlc.narg('search_query'), COALESCE(mi.author, '')) > 0.3 OR
        word_similarity(sqlc.narg('search_query'), COALESCE(mi.series, '')) > 0.3 OR
        EXISTS (
-         SELECT 1 FROM unnest(mi.tags) AS tag
+         SELECT 1 FROM unnest(mi.tags_search) AS tag
          WHERE word_similarity(sqlc.narg('search_query'), tag) > 0.3
          LIMIT 1
        ) OR
        EXISTS (
-         SELECT 1 FROM unnest(mi.contributors) AS contributor
+         SELECT 1 FROM unnest(mi.contributors_search) AS contributor
          WHERE word_similarity(sqlc.narg('search_query'), contributor) > 0.3
          LIMIT 1
        )
@@ -407,12 +409,12 @@ WHERE COALESCE(lv.is_visible, true) = true
        word_similarity(sqlc.narg('search_query'), COALESCE(mi.series, '')),
        COALESCE(
          (SELECT MAX(word_similarity(sqlc.narg('search_query'), tag))
-          FROM unnest(mi.tags) AS tag),
+          FROM unnest(mi.tags_search) AS tag),
          0
        ),
        COALESCE(
          (SELECT MAX(word_similarity(sqlc.narg('search_query'), contributor))
-          FROM unnest(mi.contributors) AS contributor),
+          FROM unnest(mi.contributors_search) AS contributor),
          0
        )
    ) DESC,