Resolve view term labels from /ns instead of the Linked Data proxy

[namedgraph]

Context

Client-side counterpart of #337 (the dumb Linked Data proxy). With the proxy no longer serving ontology terms, the view's term-label resolution must go through the app's /ns SPARQL endpoint (ACL-enforced) rather than proxying each term's vocabulary document.

Four view.xsl controls resolved predicate/class labels via GET ?uri=<ac:document-uri(term)> (the proxy) then ac:label:

• order-by dropdown
• facet headers (RenderFacets)
• parallax properties (RELATED RESULTS)
• rdf:type facet values

Change

• view-results chain (ldh:view-results-thunk): add a property-metadata load step (mirroring the existing object-metadata step) that DESCRIBEs the result predicates over /ns before ldh:render-view, threading $property-metadata through to the order-by and facet-header rendering. Reuses the existing ldh:load-property-metadata / ldh:set-property-metadata helpers in block.xsl.
• order-by + facet headers: render labels synchronously from $property-metadata via ac:label (local-name fallback for terms not in the closure). Drops the per-predicate proxy promises and the now-unused ldh:order-by-response / ldh:facet-filter-response handlers. These controls also become deterministically ordered (no more render races).
• parallax + rdf:type facet values: swap each per-term proxy GET ?uri= for a POST /ns DESCRIBE $Type VALUES { <term> }. The response is still application/rdf+xml, so ldh:parallax-property-response / ldh:facet-value-type-response (and their local-name/URI fallbacks) are unchanged.

No changes to ac:label/ac:description (Web-Client, SSR-pure) or the LDH ac:property-label/ac:object-label overrides — they already consume the $property-metadata tunnel.

Net: -124 / +62 lines.

Verification

Verified against the running unesco-thesaurus demo (new SEF), comparing before/after HAR captures of the same page /concepts/concept1002/:

Vocab document (?uri= proxy)	before	after
skos/core	9×	5×
rdf-syntax-ns	2×	1×
prov	2×	1×
total proxy ?uri=	49	43

The SKOS view predicates (skos:broader, skos:related, skos:inScheme, rdf:type, …) now appear in the /ns DESCRIBE $Type VALUES {…} bodies; the parallax panel renders their real ontology labels ("has broader", "is in scheme", "is top concept in scheme", "type"). The before-capture's 429 (rate-limited /) and 502 (/sparql) from the redundant proxy load are gone — after-capture proxy responses are all 200, all five /ns responses 200, zero console errors.

Note: base is raw-ontology-serving (stacked on #337) because this change assumes the dumb proxy. Re-target to develop if #337 lands first.

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