fix(messaging): parse postbackText from Gupshup list_reply, pass selection ID to AI

Gupshup list_reply has empty id field — postbackText carries our ID.
Fixed ?? to || fallback. Also inject selection_id into user message so
AI can extract doctorId from "doc:{uuid}:{name}" format.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/messaging/messaging.service.ts

@@ -72,9 +72,15 @@ export class MessagingService {
 
         // 3. Load conversation history
         const history = await this.conversation.getHistory(phone);
+        // For interactive replies, include the selection ID so the AI can
+        // extract structured data (e.g. "doc:{uuid}:{name}" → doctorId)
+        let userContent = text;
+        if (message.type === 'interactive_reply' && message.interactiveReply?.id) {
+            userContent = `[Selected: ${message.interactiveReply.title}] (selection_id: ${message.interactiveReply.id})`;
+        }
         const messages = [
             ...history.map(h => ({ role: h.role as 'user' | 'assistant', content: h.content })),
-            { role: 'user' as const, content: text },
+            { role: 'user' as const, content: userContent },
         ];
 
         // 4. Build system prompt