feat(medusa,dashboard,admin-sdk): Run admin dashboard from Medusa instance (#7330)

packages/admin-next/dashboard/src/components/layout/main-layout/main-layout.tsx

@@ -13,13 +13,12 @@ import { Avatar, Text } from "@medusajs/ui"
 import * as Collapsible from "@radix-ui/react-collapsible"
 import { useTranslation } from "react-i18next"
 
+import { ComponentType } from "react"
 import { useStore } from "../../../hooks/api/store"
 import { Skeleton } from "../../common/skeleton"
 import { NavItem, NavItemProps } from "../../layout/nav-item"
 import { Shell } from "../../layout/shell"
 
-import extensions from "medusa-admin:routes/links"
-
 export const MainLayout = () => {
   return (
     <Shell>
@@ -167,6 +166,10 @@ const CoreRouteSection = () => {
   )
 }
 
+const extensions = {
+  links: null as { path: string; label: string; icon?: ComponentType }[] | null,
+}
+
 const ExtensionRouteSection = () => {
   if (!extensions.links || extensions.links.length === 0) {
     return null