Add error handling for 403 status in NostrmarketAPI

- Implement a specific error message for 403 responses, indicating that the NostrMarket extension may not be enabled for the user.
- This change enhances user feedback and clarifies access issues related to the Nostrmarket service.

src/modules/market/services/nostrmarketAPI.ts

@@ -132,6 +132,11 @@ export class NostrmarketAPI extends BaseService {
         return null as T
       }
       
+      // If 403, likely the nostrmarket extension is not enabled for this user
+      if (response.status === 403) {
+        throw new Error(`Access denied: Please ensure the NostrMarket extension is enabled for your LNbits account. Contact your administrator if needed.`)
+      }
+      
       throw new Error(`NostrmarketAPI request failed: ${response.status} ${response.statusText}`)
     }