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