Wires the ADR-010 get_map_overlays hook into the floor map so a plugin decorates
markers as JSON, no map code. ShopFloorMap fetches /api/pluginui/map-overlays,
then each overlay's endpoint (per-asset [{assetid, color, label}]), joins by
assetid, and draws a ring or badge circleMarker on matching markers plus a
legend entry - all as extra Leaflet layers cleared and redrawn with the markers.
Aligned the measuringtools calibration overlay endpoint to the documented
contract: it now returns {assetid, color, label} (was {calibrationstatus,
statuscolor}) and only decorates due/overdue tools.
Additive + guarded (assetid null check, per-endpoint try/catch, cleanup on
re-render), so the map degrades to no decorations on any failure. Verified: the
overlay endpoint serves the contract shape, the map renders without error, and
the frontend builds. A populated badge needs a site that actually places
measuring tools on its map (this dataset places none). 38 measuringtools/pluginui
tests, 58 vitest, build + naming green.
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