修复 src 结构

src/component/formItem/index.ts

@@ -0,0 +1,9 @@
+import type { App } from "vue";
+import Component from "./index.vue";
+import type { IDefineComponent } from "../type/index";
+
+Component.install = (app: App) => {
+  app.component(Component.name || "LayFormItem", Component);
+};
+
+export default Component as IDefineComponent;