nix: finish the current-behaviour comment sweep in touched files

Rewrite the remaining narration in files the previous commit touched:
"moved"/"sat"/"was REMOVED"/"old default" comments in swarm-bao,
swarm-otel, glue-bao-tls, nats-authelia, swarm-controller, swarm-ui,
swarm-otel-service, swarm-authelia-service, the deploy.nix rename table,
hive-ci, hive-forge/service, hive-tls, hyperhive, swarm-nats, swarm.nix
and a few module-eval fixtures, so each says where a thing is or why it
is so now.

Revert the comment edits inside shell script strings in hive-tls,
swarm-nats and the forge token mint to their previous text, so those
generated units are unchanged. The only unit still changing is
swarm-bao-pki (two comment lines in its script). Refs #3902

nix/host-modules/hive-gateway/vhosts.nix

@@ -44,7 +44,7 @@ let
   publicPortSuffix = if publicPort == 443 then "" else ":${toString publicPort}";
 
   # `<hive>/matrix/*` → 301 → `gatewayHost`'s vhost/$1 (`chat.<swarm-domain>`
-  # by default; legacy deep-link shim during the fluffychat sub-domain move).
+  # by default; legacy deep-link shim for the fluffychat sub-domain).
   # See `docs/networking/gateway.md`.
   matrixRedirectLocations =
     lib.optionalAttrs (matrixDeployCfg.enable && matrixCfg.gatewayHost != null)