GrottoCenter / grottocenter-api / 26531098449

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fix(massif): validate polygon geometry before area computation

Closes #1606. PostGIS ST_Area() on geography type throws an unhandled
XX000 error when a polygon has invalid winding order or other geometry
issues. This caused a 500 on massif creation with complex MultiPolygons.

- Add MassifService.validatePolygon() that checks ST_IsValid and catches
  XX000 errors from ST_Area, returning user-friendly error messages
- Map PostGIS/GEOS error keywords to actionable messages via a single
  POLYGON_ERROR_MESSAGES table
- Apply validation in both create and update controllers
- Add regression tests for invalid winding order and self-intersecting
  polygons on both POST and PUT endpoints
- Add unit tests for matchPolygonError mapping function

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