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POST https://www.ai-library.asia/api/submit
Authorization: Bearer <Token>
Content-Type: application/json

{
  "title": "学习包标题",
  "description": "简短描述",  
  "content": "详细内容...",
  "tags": ["标签1", "标签2"],
  "difficulty": "初级|中级|高级"
}