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.

tests/server/lan-discovery.test.ts

@@ -194,7 +194,7 @@ describe('LAN discovery', () => {
   })
 
   it('exposes an MCP terminal list tool so agents can recover forgotten terminal ids', () => {
-    const mcpSource = readFileSync('bin/hermes-studio-mcp.mjs', 'utf8')
+    const mcpSource = readFileSync('bin/hermes-ui-mcp.mjs', 'utf8')
 
     expect(mcpSource).toContain("name: 'hermes_studio_lan_devices_list'")
     expect(mcpSource).toContain('online status')