- Fix BUG1: JavaScript timeout with proper thread interruption using ScheduledExecutorService
- Fix BUG2: Add URL regex validation before execution in playground test API
- Fix BUG3: Register published parsers to CustomParserRegistry on save/update/delete
- Remove TypeScript compiler functionality (tsCompiler.js, dependencies, UI)
- Add password authentication for playground access
- Add mobile responsive layout support
- Load playground parsers on application startup
