ci: add fmt help test to CI workflow

Co-authored-by: fengmk2 <156269+fengmk2@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -115,6 +115,7 @@ jobs:
           vite-plus lint -h
           vite-plus test -h
           vite-plus build -h
+          vite-plus fmt -h
 
   e2e-test:
     name: E2E test