ci: add CD — auto deploy to Cloudflare Workers on push to main

Test → Build UI → wrangler deploy. Secrets configured.

小橘 🍊（NEKO Team）

.github/workflows/ci.yml

@@ -16,3 +16,21 @@ jobs:
           node-version: 22
       - run: npm install
       - run: npm test
+
+  deploy:
+    needs: test
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - run: npm install
+      - name: Build UI
+        run: cd packages/engine/ui && npm run build && cp dist/index.html ../src/ui.html
+      - name: Deploy to Cloudflare Workers
+        run: cd packages/engine && npx wrangler deploy
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}