{ "url": "https://example.com/long" }
// api_key optional (uses saved key if omitted)

{ "success": true,
  "shortUrl": "https://shortner.spcfy.eu/r/abc123",
  "code":    "abc123",
  "originalUrl": "https://example.com/long" }

curl -X POST https://shortner.spcfy.eu/api/shorten \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com"}'

GET https://shortner.spcfy.eu/api/shorten?api=KEY&url=https://...