add_card
Create a new flashcard in Anki. Requires: deckName (exact deck name), modelName (note type like 'Basic' or 'Cloze'), and fields object matching the note type's field names. Returns card ID on success. FORMATTING: Use HTML only (NO markdown) - <br> for line breaks, <strong> for bold, <em> for italic, <ol>/<li> for lists. Media files (audio/picture) support URLs or local absolute paths.