Update dependencies and configuration files

- Added new dependencies: `plotly`, `websocket`, `cffi`, `gevent`, `greenlet`, and `narwhals` to `pyproject.toml` and `uv.lock`.
- Updated `.gitignore` to exclude the `frontend/` directory.
- Modified configuration files to set `start_date` to `2025-01-01` in `config_bbrs.json` and `config_default.json`, with `stop_date` set to `null` in both.
- Introduced a new project metadata file `.cursor/project.mdc` for project documentation and management.

.gitignore

@@ -176,3 +176,5 @@ README.md
 .vscode/launch.json
 data/btcusd_1-day_data.csv
 data/btcusd_1-min_data.csv
+
+frontend/