Update customer developer fees

Updates the developer fee configuration for the customer. These fees are deducted from customer deposits before USDC is sent to their wallet. **Fee Types** - `developerSpreadFeeBps`: Spread fee in basis points (0-2500, max 25%). Applied to the USDC amount. **Fee Calculation** ``` spreadFee = amount × spreadFeeBps / 10000 customerReceives = amount - spreadFee ``` **Example:** 1000 USDC deposit with 1% spread (100 bps) → customer receives 990 USDC

spreadFee = amount × spreadFeeBps / 10000
customerReceives = amount - spreadFee

curl -X PATCH 'https://compose.finance/api/v2/customers/{customerId}/developer-fees' \  -H 'Authorization: Bearer YOUR_API_KEY' \  -H 'Content-Type: application/json' \  -d '{    "developerSpreadFeeBps": 100  }'

{
  "customerId": "550e8400-e29b-41d4-a716-446655440001",
  "developerSpreadFeeBps": 100,
  "updatedAt": "2024-01-15T10:30:00.000Z"
}

{
  "error": "Invalid request data"
}

{
  "error": "Unauthorized - Invalid or missing API key or session"
}

{
  "error": "Customers feature is not enabled for your organization"
}

{
  "error": "Invalid request data"
}