feat: Add scripts for sending admin and test notes via Nostr

- Introduce `send_admin_note.js` for sending community announcements to Nostr relays.
- Implement `send_test_note.js` for testing note sending with specified private key and relay URL.
- Enhance `NostrFeed.vue` to filter notes based on admin pubkeys and display appropriate titles and descriptions for different feed types.
- Update `Home.vue` to use the announcements feed type for the Nostr feed component.

send_test_note.js

@@ -0,0 +1,70 @@
+#!/usr/bin/env node
+
+// Test script to send a Nostr note using nostr-tools
+// Usage: node send_test_note.js <nsec> <relay_url> <message>
+
+import { SimplePool, getPublicKey, finalizeEvent, nip19 } from 'nostr-tools'
+
+async function sendTestNote(nsecInput, relayUrl, message) {
+  try {
+    // Parse the private key
+    let privateKey;
+    if (nsecInput.startsWith('nsec')) {
+      const decoded = nip19.decode(nsecInput);
+      privateKey = decoded.data;
+    } else {
+      // Assume hex
+      privateKey = Buffer.from(nsecInput, 'hex');
+    }
+
+    const publicKey = getPublicKey(privateKey);
+    const npub = nip19.npubEncode(publicKey);
+
+    console.log(`Sending note from: ${npub}`);
+    console.log(`To relay: ${relayUrl}`);
+    console.log(`Message: ${message}`);
+
+    // Create the event
+    const event = {
+      kind: 1,
+      created_at: Math.floor(Date.now() / 1000),
+      tags: [],
+      content: message,
+      pubkey: publicKey,
+    };
+
+    // Sign the event
+    const signedEvent = finalizeEvent(event, privateKey)
+
+    // Connect to relay and publish
+    const pool = new SimplePool();
+    const relays = [relayUrl];
+
+    console.log('Connecting to relay...');
+    await pool.publish(relays, signedEvent);
+
+    console.log('✅ Event published successfully!');
+    console.log('Event ID:', signedEvent.id);
+    
+    // Wait a bit then close
+    setTimeout(() => {
+      pool.close(relays);
+      process.exit(0);
+    }, 2000);
+
+  } catch (error) {
+    console.error('❌ Failed to send note:', error.message);
+    process.exit(1);
+  }
+}
+
+// Parse command line arguments
+const args = process.argv.slice(2);
+if (args.length < 3) {
+  console.log('Usage: node send_test_note.js <nsec> <relay_url> <message>');
+  console.log('Example: node send_test_note.js nsec1abc123... wss://relay.example.com "Hello world!"');
+  process.exit(1);
+}
+
+const [nsec, relayUrl, message] = args;
+sendTestNote(nsec, relayUrl, message);