feat(nostr): Implement Nostr Feed with real-time note fetching

- Add NostrFeed component to display Nostr network notes
- Integrate date-fns for human-readable timestamp formatting
- Enhance NostrClient with fetchNotes and subscribeToNotes methods
- Implement loading, error, and empty state handling
- Add scrollable card-based UI for note display
- Configure dynamic relay selection with fallback to environment variables

src/pages/Home.vue

@@ -1,10 +1,12 @@
 <template>
-
+  <div class="container py-8">
+    <NostrFeed />
+  </div>
 </template>
 
 <script setup lang="ts">
 import { useI18n } from 'vue-i18n'
+import NostrFeed from '@/components/nostr/NostrFeed.vue'
 
 const { t } = useI18n()
-
 </script>