refactor: remove empty services (#116)

* remove empty services

* remove old factory

* remove old static files

* cleanup more duplicate service code

* file/folder reorg

backend/internal/sys/config/conf_mailer_test.go

@@ -0,0 +1,40 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_MailerReady_Success(t *testing.T) {
+	mc := &MailerConf{
+		Host:     "host",
+		Port:     1,
+		Username: "username",
+		Password: "password",
+		From:     "from",
+	}
+
+	assert.True(t, mc.Ready())
+}
+
+func Test_MailerReady_Failure(t *testing.T) {
+	mc := &MailerConf{}
+	assert.False(t, mc.Ready())
+
+	mc.Host = "host"
+	assert.False(t, mc.Ready())
+
+	mc.Port = 1
+	assert.False(t, mc.Ready())
+
+	mc.Username = "username"
+	assert.False(t, mc.Ready())
+
+	mc.Password = "password"
+	assert.False(t, mc.Ready())
+
+	mc.From = "from"
+	assert.True(t, mc.Ready())
+
+}