Phase 002: rebrand to hermes-ui and consolidate i18n to zh/en

Removes the ekko / hermes-web-ui branding from the whole tree and drops
eight locale files, so the project presents one name and one language pair.

Data compatibility is deliberate, not accidental: DB filenames, the JWT
audience, and skill manifest ownership all still recognise their pre-rename
values so existing deployments under ~/.hermes-web-ui keep working without a
re-login or a re-injection.

scripts/harness-check.mjs now scans for the legacy strings and fails the
build on any new occurrence, with an explicit allow-list (and reasons) for
the compatibility paths that must keep them.

packages/server/src/db/index.ts

@@ -12,6 +12,8 @@ const DB_DIR = isTest
   : isDev
   ? resolve(process.cwd(), 'packages/server/data')
   : config.appHome
+// These filenames predate the hermes-web-ui -> hermes-ui rename. They are kept so
+// existing deployments under ~/.hermes-web-ui keep finding their data.
 const DB_PATH = resolve(DB_DIR, 'hermes-web-ui.db')
 const JSON_PATH = resolve(DB_DIR, 'hermes-web-ui.json')