add migration code

migration_js/migration.js

@@ -0,0 +1,34 @@
+import { app } from "../../scripts/app.js";
+import { api } from "../../scripts/api.js";
+
+app.registerExtension({
+	name: "Comfy.ManagerExtMenu",
+	init() {
+		$el("style", {
+			textContent: style,
+			parent: document.head,
+		});
+	},
+	async setup() {
+			let cmGroup = new (await import("../../scripts/ui/components/buttonGroup.js")).ComfyButtonGroup(
+				new(await import("../../scripts/ui/components/button.js")).ComfyButton({
+					icon: "puzzle",
+					action: async () => {
+						if(confirm('As some features of ComfyUI Manager have been integrated into ComfyUI, they have been separated into manager-core.\n\nComfyUI Manager only includes additional extension features that are not provided by manager-core.\n\nWill you install manager-core?')) {
+							app.ui.dialog.show('Installing manager-core...');
+							app.ui.dialog.element.style.zIndex = 10010;
+
+							await api.fetchApi("/manager/install_manager_core");
+
+							app.ui.dialog.show('The installation of manager-core will be completed after restarting.');
+						}
+					},
+					tooltip: "Need to install manager-core",
+					content: "Manager (Need To Install)",
+					classList: "comfyui-button comfyui-menu-mobile-collapse primary"
+				}).element
+			);
+
+			app.menu?.settingsGroup.element.before(cmGroup.element);
+	}
+});