remove unused action

.github/workflows/ui-build-self-hosted.yml

@@ -1,43 +0,0 @@
-name: UI Build (self-hosted)
-
-on:
-  workflow_call:
-
-jobs:
-  build:
-    runs-on: [self-hosted, fast]
-    env:
-      BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v6
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v6
-        with:
-          node-version: "24"
-          cache: "npm"
-          cache-dependency-path: "tools/ui/package-lock.json"
-
-      - name: Install dependencies
-        run: npm ci
-        working-directory: tools/ui
-
-      - name: Build application
-        run: npm run build
-        working-directory: tools/ui
-
-      - name: Generate checksums
-        run: |
-          cd tools/ui/dist
-          for f in *; do
-            sha256sum "$f" | awk '{print $1, $2}' >> checksums.txt
-          done
-
-      - name: Upload built UI
-        uses: actions/upload-artifact@v6
-        with:
-          name: ui-build
-          path: tools/ui/dist/
-          retention-days: 1