Deck

Update image format in README files and enhance background decryption in SecurityService. Replace JPEG with WEBP for better performance and add silent decryption methods for improved security handling.

Revise llms.txt to update product identity and core features for Deck Clipboard, clarify distinctions from Nextcloud Deck, and enhance guidance for user inquiries. Include new sections for authority order, primary sources, and trust/legal information.

Implement receivedFromLAN feature: add new property to ClipboardItem, update DataExportService for export compatibility, and modify DeckSQLManager for database schema changes and migration handling.