feat: Enhance admin announcement functionality and introduce PWA installation prompt

- Update sendAdminAnnouncement to support multiple configured admin pubkeys and improve console output for clarity.
- Add new script send_posts_from_configured_admins.js to send posts from multiple admins for testing purposes.
- Implement PWAInstallPrompt component to guide users in installing the app, including handling installation status and browser compatibility.
- Integrate PWAInstallPrompt into Home.vue for improved user experience.

send_admin_note.js

@@ -17,10 +17,15 @@ async function sendAdminAnnouncement() {
   try {
     console.log('🚀 Sending admin announcement...')
 
-    // Use the configured admin pubkey from your .env file
-    const configuredAdminPubkey = "c116dbc73a8ccd0046a2ecf96c0b0531d3eda650d449798ac5b86ff6e301debe"
+    // Configured admin pubkeys from your .env
+    const configuredAdminPubkeys = [
+      "4b9d7688eba64565dcb77cc8ab157eca1964d5de9f7afabe03eb5b54a43d9882",
+      "30b1ab3683fa6cc0e3695849ee1ec29e9fbae4c9e7ddb7452a4ddb37a0660040", 
+      "c116dbc73a8ccd0046a2ecf96c0b0531d3eda650d449798ac5b86ff6e301debe"
+    ]
 
-    // For demo purposes, generate a keypair (in real use, you'd have the actual admin nsec)
+    // For demo: generate a keypair, but let's use a specific admin pubkey for testing
+    // In real use, you'd use the actual admin private key
     const privateKey = generateSecretKey()
     const publicKey = getPublicKey(privateKey)
     const nsec = nip19.nsecEncode(privateKey)
@@ -30,11 +35,13 @@ async function sendAdminAnnouncement() {
     console.log(`Public Key (npub): ${npub}`)
     console.log(`Hex pubkey: ${publicKey}`)
     console.log('')
-    console.log(`📋 Your configured admin pubkey: ${configuredAdminPubkey}`)
+    console.log(`📋 Your configured admin pubkeys: ${configuredAdminPubkeys.length}`)
+    configuredAdminPubkeys.forEach((pubkey, i) => {
+      console.log(`   ${i + 1}. ${pubkey.slice(0, 16)}...`)
+    })
     console.log('')
-    console.log('💡 To see this as an admin post, either:')
-    console.log(`   1. Update .env: VITE_ADMIN_PUBKEYS='["${publicKey}"]'`)
-    console.log(`   2. Or use the configured admin's actual nsec key`)
+    console.log('💡 To see this as an admin post:')
+    console.log(`   Add this pubkey to your .env: "${publicKey}"`)
     console.log('')
 
     // Create announcement content