Fix CI: use npm install instead of npm ci (no lockfile)

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

Author: 2 people

.github/workflows/deploy.yml

@@ -28,10 +28,9 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 20
-          cache: npm
 
       - name: Install dependencies
-        run: npm ci
+        run: npm install
 
       - name: Build
         run: npm run build