Fix type hints and dependency issues for CI

- Add -r requirements.txt to requirements-dev.txt
- Fix mypy errors:
  - Remove slots=True from Settings dataclass
  - Add explicit list[float] type annotations in hedge.py
  - Add type ignore comments for optional QuantLib imports
  - Use Sequence instead of list in GreeksTable for covariance
  - Fix dict type annotation in options.py
  - Add type ignore for nicegui attr-defined errors
- Disable attr-defined error code in mypy config

pyproject.toml

@@ -22,7 +22,7 @@ extend-exclude = '''
 
 [tool.mypy]
 ignore_missing_imports = true
-pythonpath = ["."]
+disable_error_code = ["attr-defined"]
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]