fix: update references from setting to system_setting for ServerAddress

setting/system_setting/system_setting_old.go

@@ -0,0 +1,10 @@
+package system_setting
+
+var ServerAddress = "http://localhost:3000"
+var WorkerUrl = ""
+var WorkerValidKey = ""
+var WorkerAllowHttpImageRequestEnabled = false
+
+func EnableWorker() bool {
+	return WorkerUrl != ""
+}