docs: fix stale package README claims found while writing subsystem pages

- dsh-host-webserver: the service is HttpServerService under ctx.httpServer
  (README said WebServerService/ctx.webServer, matching no symbol in source),
  and the dev-mode bundle-watch paragraph described machinery that moved to
  dsh-client-modules/dsh-client-hmr in the webserver rewrite — removed; those
  packages' READMEs already document the current pipeline.
- dsh-workspace: ctx.workspace.touchSession(id) does not exist; the
  activity-pinning chain was replaced by Workspace.insertSessionBefore
  (2026-07-25 session-list note) — the bullet now documents the real method.
- packages/storage group table: the domain package directory is
  storage-domain/, not domain/.

All three pairs updated on both sides and re-recorded.

packages/workspace/workspace/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/workspace/workspace/README.md
-README.md: bfa044de50fc71dca95637487df50dc551d40e1b
+README.md: 057765e38de9cc700210eb8edeb1ddc7ffc861ff
 README.zh.md: f3be9611eba45db3719ce76ad6625f4787fab9ac