feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/sender/test_message.go

@@ -0,0 +1,13 @@
+package sender
+
+import (
+	"rsgit.ru/rsmon/rsmon/app/models"
+)
+
+func TestMessage(contact *models.Contact) (*string, error) {
+	message := models.Message{
+		Contact: contact,
+		Kind:    "test",
+	}
+	return RunMessage(&message)
+}