build: add test step to deploy workflow

Tests now run before build in CI. A failing test will block
deployment, ensuring only verified code reaches production.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: beihaili

.github/workflows/deploy.yml

@@ -35,6 +35,9 @@ jobs:
     - name: Install Dependencies 📦
       run: npm ci
 
+    - name: Run Tests 🧪
+      run: npm test
+
     - name: Build Application 🔨
       run: npm run build
       env: