Invoke Skill Reports Forecast Prepare

curl https://api.dev.arch.ie/api/v1/skills/reports.forecast.prepare/invoke \
  -X POST \
  -H "Authorization: Bearer sk_..." \
  -H "Content-Type: application/json" \
  -d '{
       "client_id": "00000000-0000-0000-0000-000000000000",
       "horizon_months": 0,
       "scenarios": [
         "base"
       ],
       "projection_type": [
         "pnl"
       ],
       "seasonal_adjustment": false,
       "growth_assumptions": {},
       "output_format": "data"
     }'