Update Feature

PUT /api/v1/projects/{slug}/features/{featureId}

curl -X PUT https://cuprice.io/api/v1/projects/my-saas-app/features/101 \
  -H "Authorization: Bearer cpk_your_key_here" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "AI Prompts (v2)",
    "basePrice": 12,
    "usageCount": 1000,
    "countPrice": 0.015
  }'

{
  "id": 101,
  "name": "AI Prompts (v2)",
  "description": "Monthly AI prompt allowance",
  "basePrice": 12,
  "featureType": "Limits",
  "isCountable": true,
  "countableData": {
    "usageCount": 1000,
    "condition": "Up to",
    "countPrice": 0.015,
    "eventAggregationMethod": "count"
  },
  "createdAt": "2025-09-15T10:35:00.000Z",
  "updatedAt": "2025-12-05T11:20:00.000Z"
}