refactor(services): rename EbookScanner to MediaScanner
- Rename EbookScanner struct to MediaScanner - Rename EbookMetadata struct to MediaMetadata - Rename NewEbookScanner to NewMediaScanner - Rename processEbookFile to processMediaFile - Rename updateEbook to updateMediaItem - Rename getEbookByFilePath to getMediaItemByFilePath - Remove unused isEbookFile method - Update all method receivers - Update variable names (ebookFiles -> mediaFiles, existingEbook -> existingItem) - Update print statements to use 'media' terminology - Update worker.go to use NewMediaScanner - File renamed: ebook_scanner.go -> media_scanner.go
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