Remove package-lock.json files and update .gitignore

- Removed package-lock.json from root and fuzz_test/ (auto-generated files)
- Added package-lock.json to .gitignore to prevent future tracking
- These files are automatically recreated by npm install

Author: jialinli98

.gitignore

@@ -6,6 +6,7 @@ gates_report.json
 
 # Node.js dependencies
 node_modules/
+package-lock.json
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*