v1.0.1.0

Fix critical bugs and improve code quality

- Add ApiClient null-safety checks throughout
- Fix MutationObserver performance with throttling
- Fix fallbackPlayback to actually use constructed URL
- Remove duplicate JS loading in config.html
- Add SeriesId validation for Season items
- Fix Dashboard.alert reference
- Improve checkEpisodeList efficiency
- Add proper cleanup in destroy()
- Better error handling in checkItemType