Nanopublication / nanopub-java / 23729181399

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fix: prevent HTTP connection pool exhaustion under concurrent load

Increase connectionRequestTimeout from 500ms to 10s to match the other
timeouts — 500ms was too aggressive for a shared pool under concurrent
load, causing "Timeout waiting for connection from pool" errors
(knowledgepixels/nanodash#416).

Also fix two connection leak paths: consume response entities in
QueryCall.getApiInstances() health checks, and ensure QueryAccess.call()
always releases connections via try-with-resources and a finally block.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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