ArduPilot / MethodicConfigurator / 23459576880

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fix(reliability): replace SystemExit with catchable ParamFileError

SystemExit on malformed .param files kills the entire GUI with no
recovery. Users lose unsaved work with no opportunity to fix the file.

- Add ParamFileError(ValueError) exception class
- Replace all 9 raise SystemExit in data_model_par_dict.py
- Narrow try/except ValueError to only cover float() conversion,
  moving isfinite check outside to avoid subclass catch conflict
- Update all 5 callers to catch ParamFileError instead of SystemExit
- Update all tests across 5 test files to expect ParamFileError
- Wrap long import line in annotate_params.py

Closes #1416

Signed-off-by: Yash Goel <yashhzd@users.noreply.github.com>

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