refactor: remove legacy react ui

.github/workflows/ci.yml

@@ -65,24 +65,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
 
-      - name: Install Node.js
-        uses: actions/setup-node@v6
-        with:
-          node-version: 22
-          cache: npm
-          cache-dependency-path: apps/ui/package-lock.json
+      - name: Validate static UI files
+        run: |
+          test -f apps/ui/Dockerfile
+          test -f apps/ui/index.html
+          test -f apps/ui/nginx.conf
 
-      - name: Install UI dependencies
-        working-directory: apps/ui
-        run: npm ci
-
-      - name: Build UI
-        working-directory: apps/ui
-        run: npm run build
-
-      - name: Run UI tests
-        working-directory: apps/ui
-        run: npm run test -- --run
+      - name: Build UI image
+        run: docker build -f apps/ui/Dockerfile .
 
   deployment:
     name: Deployment Artifacts