Connect sign-up to Sendico Facts intake (#46)

backend/product/app/api/config.go

@@ -3,10 +3,12 @@ package api
 import (
 	mwa "git.sendico.io/tech/sxchnge/product/auth/config"
 	"git.sendico.io/tech/sxchnge/product/notifications"
+	"git.sendico.io/tech/sxchnge/product/providers/sendico"
 	verificationconfig "git.sendico.io/tech/sxchnge/product/verification/config"
 )
 
 type Config struct {
+	Sendico *sendico.Config `yaml:"sendico"`
 	// nil preserves the legacy v1 mount; an explicit empty list installs no API.
 	Versions      []Mount                    `yaml:"versions"`
 	Notifications *notifications.Config      `yaml:"notifications"`