move frontend to upper dir.

src/stores/README.md

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+# Store
+
+Pinia stores are used to store reactive state and expose actions to mutate it.
+
+Full documentation for this feature can be found in the Official [Pinia](https://pinia.esm.dev/) repository.

src/stores/app.js

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+// Utilities
+import { defineStore } from 'pinia'
+
+export const useAppStore = defineStore('app', {
+  state: () => ({
+    //
+  }),
+})

src/stores/index.js

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+// Utilities
+import { createPinia } from 'pinia'
+
+export default createPinia()