feat(media_scanner): implement smart metadata merging and ComicInfo.xml v2.0 support
Phase 2-3 implementation: Complete ComicInfo.xml parsing with intelligent Calibre merging.
Data Structure Updates:
- ComicInfo struct: Add 19 ComicInfo.xml v2.0 fields (Manga, LanguageISO, Count,
AlternateSeries, AlternateNumber, AlternateCount, Summary, Imprint, StoryArc,
SeriesGroup, AgeRating, CommunityRating, MainCharacterOrTeam, Review,
BlackAndWhite, ScanInformation, Characters, Teams, Locations)
- MediaMetadata struct: Add 14 fields for reading direction and universal/comic metadata
New Functions:
- mergeMetadata(): Smart merging with priority: Calibre metadata.opf → ComicInfo.xml →
embedded metadata. Extracts reading direction even when metadata.opf exists.
- normalizeMangaType(): Normalize ComicInfo.xml Manga field to database enum
- determineReadingDirection(): Compute reading direction from Manga + language + genre heuristics
- normalizeAgeRating(): Standardize age rating values (Everyone, Teen, Mature, Adult)
- processGenresAndTags(): Universal genre/tag processing for all formats
- extractGenreTagsFromEPUB(): Extract all <dc:subject> values from EPUB
- extractGenreTagsFromComicInfo(): Extract genres from Genre + Tags + Characters + Teams + Locations
- containsTag(): Helper to prevent duplicate tags
Logic Changes:
- extractMetadata(): Now calls mergeMetadata() for smart metadata combination
- processMediaFile(): Updated CreateMediaItem call with all 14 new fields
- Removed duplicate comic metadata extraction (now handled by mergeMetadata)
- CommunityRating uses simple pgtype.Float8 (DOUBLE PRECISION) instead of pgtype.Numeric
This enables complete ComicInfo.xml v2.0 support with 19 fields plus 5 universal fields
that apply to all media formats (ebooks, audiobooks, comics).
Relates to: Phase 2 (data structures), Phase 3 (smart merging), Phase 4 (media item creation)
john-okeefe
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