Add GET /api/story-cards/export and POST /api/story-cards/import for a
scenario or adventure, using the AI Dungeon world-info array shape
(keys/value/type/title/description/useForCharacterCreation) mapped to our
columns. Import accepts a bare array or {cards|storyCards|worldInfo:[...]},
enforces the per-owner cap (existing + incoming) and import rate limit.
Export/Import buttons added to the scenario editor and the in-play Plot
panel.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TEpWMjnfPqzZ13nPMoGhs5