Disallow duplicate storage paths (#26484)

Replace #26380

modules/setting/path.go

@@ -66,8 +66,12 @@ func init() {
 		AppWorkPath = filepath.Dir(AppPath)
 	}
 
+	fatalDuplicatedPath("app_work_path", AppWorkPath)
+
 	appWorkPathBuiltin = AppWorkPath
 	customPathBuiltin = CustomPath
+
+	fatalDuplicatedPath("custom_path", CustomPath)
 	customConfBuiltin = CustomConf
 }