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.

.github/workflows/docker-publish.yml

@@ -41,9 +41,9 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: true
           tags: |
-            ${{ secrets.DOCKERHUB_USERNAME }}/hermes-web-ui:latest
-            ${{ secrets.DOCKERHUB_USERNAME }}/hermes-web-ui:${{ github.sha }}
-            ${{ secrets.DOCKERHUB_USERNAME }}/hermes-web-ui:${{ github.event.release.tag_name || github.ref_name }}
+            ${{ secrets.DOCKERHUB_USERNAME }}/hermes-ui:latest
+            ${{ secrets.DOCKERHUB_USERNAME }}/hermes-ui:${{ github.sha }}
+            ${{ secrets.DOCKERHUB_USERNAME }}/hermes-ui:${{ github.event.release.tag_name || github.ref_name }}
 
   keep-release-out-of-latest:
     name: Keep release out of GitHub latest