fix(ci): install Sharp platform dependencies

.gitea/workflows/ci-cd.yml

@@ -28,7 +28,11 @@ jobs:
         run: |
           npm ci \
             --registry="https://package-mirror.liara.ir/repository/npm/" \
-            --replace-registry-host=registry.npmjs.org
+            --replace-registry-host=registry.npmjs.org \
+            --include=optional
+
+      - name: Verify image optimizer dependency
+        run: node -e "const sharp = require('sharp'); if (!sharp.format.webp.output) throw new Error('Sharp WebP output is unavailable')"
 
       - name: Lint
         run: npm run lint