{
  "version": "1.0",
  "course": {
    "title": "Course Title",          // required
    "description": "...",             // required
    "category": "offensive",          // required — offensive | defensive | forensics | crypto
    "is_free": false,                 // optional, default false
    "price_cents": 4999,              // optional, price in cents (e.g. 4999 = ₹49.99)
    "discount_percent": 20,           // optional, % discount off price_cents
    "completion_xp": 500,             // optional, bonus XP on full course completion
    "duration_minutes": 180,          // optional
    "image_url": "https://..."        // optional
  },
  "modules": [
    {
      "title": "Lesson Title",        // required
      "content": "Lesson description",// required
      "content_type": "VIDEO",        // optional — VIDEO (default) | TEXT | PDF
      "order_index": 0,               // optional, auto-assigned if omitted
      "duration_minutes": 30,         // optional
      "xp_reward": 100,               // optional, default 100

      // For content_type VIDEO — attach a video:
      "video": {
        "url": "https://youtube.com/...",
        "provider": "youtube",        // youtube | external
        "title": "Video title",
        "duration_seconds": 0
      },

      // For content_type TEXT — supply block content as JSON string:
      "text_content": "[{"id":"1","type":"heading","level":2,"text":"Intro"}]",

      // For content_type PDF — supply a publicly accessible PDF URL:
      "pdf_url": "https://example.com/lesson.pdf",

      "quiz": null                    // set to null or omit for no quiz
    }
  ]
}