Step 2 of the hive-gateway.nix vhost cleanup (follows the sub-domain
vhost extraction). Lift the two deepest-nested location groups of the
default _ server — the /matrix/ 301 redirect and the
.well-known/matrix/{client,server} discovery JSON, each carrying its own
let block — out of the inline //-chain into matrixRedirectLocations /
wellKnownLocations bindings. The _ vhost locations now open with
matrixRedirectLocations // wellKnownLocations // ... instead of two ~60-line
nested literals. agent/dashboard/auth groups stay inline (a later step).
Pure readability refactor, eval-identical: the generated
services.nginx.virtualHosts toJSON is byte-identical before/after (8888
bytes, diff empty) on a host with matrix+forge+gui+auth+tls enabled.
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