feat: integrate ZapsModule and enhance zap payment handling

- Added ZapsModule to the application, integrating it into the main app and webhooks modules.
- Introduced a new method in BTCPayService for processing payments to Lightning addresses, improving zap payout functionality.
- Updated WebhooksService to handle zap payment events, allowing for seamless integration of zap transactions.
- Enhanced UI components to display zap-related information, including zaps count and avatar stacks, improving user engagement.

These changes enhance the overall zap payment experience and ensure better integration of zap functionalities across the application.

src/composables/useContentDiscovery.ts

@@ -28,6 +28,8 @@ export interface ContentStats {
   reviewCount: number
   zapCount: number
   zapAmountSats: number
+  /** Pubkeys of recent zappers (for avatar stack on cards); max 5 */
+  recentZapperPubkeys: string[]
   recentEvents: NostrEvent[]
 }
 
@@ -92,6 +94,7 @@ function rebuildStats() {
         reviewCount: 0,
         zapCount: 0,
         zapAmountSats: 0,
+        recentZapperPubkeys: [],
         recentEvents: [],
       }
       map.set(id, stats)
@@ -164,6 +167,22 @@ function rebuildStats() {
         if (sats > 0) stats.zapAmountSats += sats
       }
 
+      // Sender pubkey for avatar stack (NIP-57: in description zap request)
+      let senderPubkey = event.pubkey
+      const descTag = event.tags.find((t) => t[0] === 'description')?.[1]
+      if (descTag) {
+        try {
+          const zapRequest = JSON.parse(descTag)
+          if (zapRequest.pubkey) senderPubkey = zapRequest.pubkey
+        } catch { /* ignore */ }
+      }
+      if (
+        stats.recentZapperPubkeys.length < 5 &&
+        !stats.recentZapperPubkeys.includes(senderPubkey)
+      ) {
+        stats.recentZapperPubkeys.push(senderPubkey)
+      }
+
       stats.recentEvents.push(event)
     }
   }
@@ -233,6 +252,7 @@ const EMPTY_STATS: ContentStats = {
   reviewCount: 0,
   zapCount: 0,
   zapAmountSats: 0,
+  recentZapperPubkeys: [],
   recentEvents: [],
 }