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/host/webserver/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/host/webserver/README.md
-README.md: b6dccf2f81c9e2f0b9f53264eafe724edb560f07
-README.zh.md: dbfe420013ed67c48e47048341f020864aeef16a
+README.md: 569c3f0c19db2c308beaef35baaf915fd39768cd
+README.zh.md: b311ebffa3fb067e684e9e443c2ac02dab917d61