feat: update ebook scanner to normalize metadata

Update extractEPUBMetadata:
- Normalize tags for display using NormalizeTags()
- Normalize contributors for display using NormalizeContributors()
- Preserves extracted metadata formatting while ensuring consistency

Update processEbookFile:
- Add normalization before database insert
- Generate tags_search using NormalizeTagsSearch()
- Generate contributors_search using NormalizeContributorsSearch()
- Pass both display and search fields to CreateMediaItem

Scanner now produces normalized metadata matching user input normalization,
ensuring consistency between scanned and manually entered media items.

Relates to Tags & Contributors Migration Phase 7

internal/services/ebook_scanner.go

@@ -452,6 +452,14 @@ func (s *EbookScanner) processEbookFile(ctx context.Context, path string) error
 		return fmt.Errorf("no library found for file path: %s", path)
 	}
 
+	// Normalize metadata fields for display
+	metadata.Contributors = utils.NormalizeContributors(metadata.Contributors)
+	metadata.Tags = utils.NormalizeTags(metadata.Tags)
+
+	// Normalize search fields
+	contributorsSearch := utils.NormalizeContributorsSearch(metadata.Contributors)
+	tagsSearch := utils.NormalizeTagsSearch(metadata.Tags)
+
 	// Create media item in database
 	createdItem, err := s.db.CreateMediaItem(ctx, database.CreateMediaItemParams{
 		LibraryID:          libraryID,
@@ -469,7 +477,9 @@ func (s *EbookScanner) processEbookFile(ctx context.Context, path string) error
 		Publisher:          pgtype.Text{String: metadata.Publisher, Valid: metadata.Publisher != ""},
 		DatePublished:      pgtype.Date{Time: metadata.PublishDate, Valid: !metadata.PublishDate.IsZero()},
 		Contributors:       metadata.Contributors,
+		ContributorsSearch: contributorsSearch,
 		Tags:               metadata.Tags,
+		TagsSearch:         tagsSearch,
 		AddedByAdminID:     s.adminID,
 	})
 	if err != nil {
@@ -576,8 +586,8 @@ func (s *EbookScanner) extractEPUBMetadata(path string) (*EbookMetadata, error)
 
 	// Contributors
 	if contributors, err := book.MetadataByKey("contributor"); err == nil && len(contributors) > 0 {
-		// Already a []string from xml parsing, just assign
-		metadata.Contributors = contributors
+		// Normalize contributors for display
+		metadata.Contributors = utils.NormalizeContributors(contributors)
 	}
 
 	// ISBN
@@ -603,8 +613,8 @@ func (s *EbookScanner) extractEPUBMetadata(path string) (*EbookMetadata, error)
 
 	// Tags
 	if tags, err := book.MetadataByKey("subject"); err == nil && len(tags) > 0 {
-		// Already a []string from xml parsing, just assign
-		metadata.Tags = tags
+		// Normalize tags for display
+		metadata.Tags = utils.NormalizeTags(tags)
 	}
 
 	return metadata, nil