Implement missing sample data loading and one-time use security

- Fix UI to load server-hosted sample data at startup as per specification
- Add one-time use security: server clears sample data after retrieval
- Ensure React app periodically checks for new sample data availability
- Remove complex same-origin protection in favor of simpler one-time use model
- Improve data security by preventing data persistence after consumption

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jmespath-playground",
-  "version": "1.1.6",
+  "version": "1.1.7",
   "description": "A React-based web application for testing JMESPath expressions against JSON data",
   "main": "index.js",
   "scripts": {