curl --location --request POST '/docmee/v1/api/ppt/updateOutline' \
--header 'Content-Type: text/plain' \
--data-raw '{
"outlineMarkdown": "# Theme\n## Chapter\n### Page Title\n#### Content Title", // Outline markdown content
"length": "medium", // Length: short/medium/long, default medium
// User modification suggestions
// System built-in: optimize using the pyramid principle, strengthen outline structure and transitions, highlight outline theme, make the outline more professional
// User-defined: for example, "Help me change the outline to a pyramid structure"
"question": null
}'{}