curl -X POST "https://olive-gateway-a6ba.onrender.com/api/v1/agents/agent_abc123/fund" \
  -H "Authorization: Bearer olive_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": "500000.00",
    "description": "Weekly float top-up"
  }'

{
  "success": true,
  "message": "Agent funded successfully",
  "transaction_id": "txn_fund_abc123",
  "amount": "500,000.00 SLE",
  "new_balance": "1,500,000.00 SLE",
  "funded_by": "admin@olive.sl"
}