MarketplaceInvitationResponseDto

{
    "success": true,
    "message": "Marketplace invitation sent successfully",
    "marketplaceId": "mkt_abc123",
    "clientId": "chowdeck_client_abc123",
    "clientSecret": "cs_secret_xyz789...",
    "invitationSentTo": "developer@chowdeck.com"
}