workflow底层UI库整合至项目，优化构建逻辑

easyflow-ui-admin/packages/tinyflow-ui/src/styles/variable.less

@@ -0,0 +1,14 @@
+
+:root,
+:root .tf-theme-light {
+  --tf-primary-color: #2563EB;
+  --xy-node-boxshadow-selected: 0 0 0 1px var(--tf-primary-color);
+  --xy-handle-background-color: var(--tf-primary-color);
+
+}
+
+
+//the dark theme variables
+:root .tf-theme-dark {
+
+}