akvo / akvo-mis / #613

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main: 88%

Pull #210

coveralls-python

[#209] Support registration-form questions in formula endpoint (decision #23)

- Formula endpoint now branches on form.parent_id is None: registration
  forms query parent__isnull=True and group by the datapoint's own id;
  monitoring forms unchanged (parent__isnull=False, group by parent_id)
- MapPopupCard shows "Not answered" for registration-form filters and
  "No monitoring data" for monitoring-form filters (decision #23)
- Add FormulaValuesRegistrationFormTests (2 tests) to cover new branch
- Update design.md §3.3 and README.md decision log

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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