Global-search rows built the plugin detail URL from a hardcoded url_map of
plugin routes in core. Now core prefers a plugin's declared
get_asset_presentation route (ADR-010), substituting the core assetid via the
plugin's by-asset resolver; types that have not declared fall back to the legacy
id-keyed map, so nothing breaks. Measuring tools (which declare the route) link
through it now; machines/PCs/printers/network migrate off the hardcode as they
add a by-asset route + declaration. Presentation map is collected once per
search (cached on flask.g). 2 consumer tests; 26 search tests green.
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