fix(overpass): tag caches by the sorted upstream set and cover installations

Uses a full SHA-256 of the sorted instance list, so reordering the same
instances for failover keeps the cache. Adds the installation-cache repoint
test (tagged, reordered, repointed, untagged, unconfigured) and the changelog
and current-state notes.
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Sameh Khamis committed 2026-10-15 10:48:38 -07:00
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# Changelog
- Overpass and military-installation disk caches no longer serve answers from a
previously configured `OVERPASS_UPSTREAMS` instance after it is repointed.
- A Radio Browser mirror answering 204, 205 or 304, or a status outside
200–599, no longer crashes the local dev/preview server. Null-body statuses
get an empty body; anything else that cannot become a response fails that