feat(settings): add Billing, Danger Zone, Domains DNS, Notification, Player, and Security settings pages

- Implemented Billing page with wallet balance, current plan, usage stats, available plans, and payment history.
- Created Danger Zone page for account deletion and data clearing actions with confirmation prompts.
- Developed Domains DNS page for managing whitelisted domains for iframe embedding, including add and remove functionality.
- Added Notification Settings page to configure email, push, marketing, and Telegram notifications.
- Introduced Player Settings page to customize video player behavior such as autoplay, loop, and controls visibility.
- Established Security and Connected Accounts page for managing user profile, two-factor authentication, and connected accounts.

src/components/icons/PlusSquareIcon.vue

@@ -0,0 +1,13 @@
+<script lang="ts" setup>
+defineProps<{
+    filled?: boolean;
+}>();
+</script>
+
+<template>
+    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+        <rect width="18" height="18" x="3" y="3" rx="2" />
+        <path d="M12 8v8" />
+        <path d="M8 12h8" />
+    </svg>
+</template>