feat(schema): Add video content schema with comprehensive examples
Video Schema Classes (9 files):
- VideoPost, VideoComment: Social media video modeling
- VideoTextContent: Base class for text content extraction
- VideoTranscript, VideoSubtitle: Text with timing and formatting
- VideoTimeSegment: Time code handling with ISO 8601 duration
- VideoAnnotation: Base annotation with W3C Web Annotation alignment
- VideoAnnotationTypes: Scene, Object, OCR detection annotations
- VideoChapter, VideoChapterList: Navigation and chapter structure
- VideoAudioAnnotation: Speaker diarization, music, sound events
Enumerations (12 enums):
- VideoDefinitionEnum, LiveBroadcastStatusEnum
- TranscriptFormatEnum, SubtitleFormatEnum, SubtitlePositionEnum
- AnnotationTypeEnum, AnnotationMotivationEnum
- DetectionLevelEnum, SceneTypeEnum, TransitionTypeEnum, TextTypeEnum
- ChapterSourceEnum, AudioEventTypeEnum, SoundEventTypeEnum, MusicTypeEnum
Examples (904 lines, 10 comprehensive heritage-themed examples):
- Rijksmuseum virtual tour chapters (5 chapters with heritage entity refs)
- Operation Night Watch documentary chapters (5 chapters)
- VideoAudioAnnotation: curator interview, exhibition promo, museum lecture
All examples reference real heritage entities with Wikidata IDs:
Q5598 (Rembrandt), Q41264 (Vermeer), Q219831 (The Night Watch)
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