- Implemented a new utility class `SymbolLoader` to parse Siemens ASC symbol files and save the output in JSON format.
- Created a `SymbolProcessor` class to handle symbol-based variable processing, including loading symbols and expanding configurations.
- Developed frontend components `FilePathWidget` and `SymbolSelectorWidget` for file selection and symbol selection respectively.
- Added API endpoints for loading symbols and browsing files.
- Introduced test scripts for validating the symbol loader and endpoint functionality.
- Added sample ASC and JSON files for testing purposes.
