Add Webots garden worlds and GeoJSON converter

[jkaflik]

Draft stacked PR. Base: spinoff/webots-gnss-tests.\n\nScope:\n- Add garden/world PROTOs and realistic/stress/simple Webots worlds.\n- Add GNSS degradation plugin/world zones.\n- Add Webots world to GeoJSON converter and generated map.\n\nKnown review notes:\n- Some terrain is visual-only and does not affect physics.\n- Operation-area inference currently collapses curbs to a rectangle.

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