refactor: move spa to frontend folder

frontend/spa/src/components/Price.vue

@@ -0,0 +1,13 @@
+<template>
+<span>{{ formatPrice(value) }} ₽</span>
+</template>
+
+<script setup>
+import {formatPrice} from "@/helpers.js";
+
+const props = defineProps({
+  value: {
+    default: 0,
+  },
+});
+</script>