curl -X PATCH "https://api.foxreach.io/api/v1/templates/ctm_abc123" \
  -H "X-API-Key: otr_your_key" \
  -H "Content-Type: application/json" \
  -d '{
    "subject": "Updated: Quick question about {{company}}"
  }'

{
  "data": {
    "id": "ctm_abc123",
    "name": "Cold Intro - SaaS",
    "subject": "Updated: Quick question about {{company}}",
    "body": "Hi {{firstName}},\n\nI noticed that {{company}} is...",
    "category": "email",
    "createdAt": "2025-01-10T08:00:00",
    "updatedAt": "2025-01-16T09:00:00"
  }
}