Maxim Dolgolyov e2e351d9c2 feat: Phase 4 планиметрии — симметрия (reflect) + правильный n-угольник (ngon) ...

- GeoEngine: _dependsOn/recompute для constr='reflect' и 'ngon_vertex'
- reflect: производная точка-отражение (P'=2·foot-P), зависит от axis+srcPt
- ngon: правильный n-угольник по центру и вершине; вершины v1..vn-1 = derived
  points (constr='ngon_vertex', хранят srcCenter/srcVertex/k/n); при движении
  центра/вершины все вершины автоматически пересчитываются
- GeoSim: _ngonSides=6, setNgonSides(n), инструменты 'reflect'/'ngon' в _handleToolClick
- lab.html: кнопки Симметрия и n-угольник, +/- контроллер сторон, хинты Phase 2

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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