Update README and localization files to enhance project description, add error messages, and improve Persian translations.

app/layouts/marketing.vue

@@ -0,0 +1,34 @@
+<template>
+  <div class="layout-marketing">
+    <!-- Marketing layout with centered content -->
+    <div class="marketing-container">
+      <slot />
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+/**
+ * Marketing Layout
+ * 
+ * Example layout for marketing pages with centered content.
+ * To use this layout in a page, add: definePageMeta({ layout: 'marketing' })
+ * 
+ * Learn more: https://nuxt.com/docs/guide/directory-structure/layouts
+ */
+</script>
+
+<style scoped>
+.layout-marketing {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.marketing-container {
+  max-width: 1200px;
+  width: 100%;
+  padding: 2rem;
+}
+</style>