ci: add release workflow, release script and smoke script

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -0,0 +1,20 @@
+name: release
+
+on: workflow_dispatch
+
+jobs:
+  release:
+    if: gitea.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+      - run: npm ci
+      - run: npm test
+      - run: npm run build
+      - run: node scripts/release.ts
+        env:
+          REGISTRY_URL: ${{ gitea.server_url }}/api/packages/${{ gitea.repository_owner }}/npm
+          TOKEN: ${{ secrets.PACKAGE_TOKEN || secrets.GITHUB_TOKEN }}