fix(ci): add cnwebsite to root workspaces for CI build (#1023)

cnwebsite was missing from root workspaces, so yarn install in CI
did not install its dependencies (including @docusaurus/core),
causing 'docusaurus: not found' during build.

Also add workflow file to paths filter so workflow changes trigger builds.

Author: sunnylqm

.github/workflows/gh-pages.yml

@@ -8,6 +8,7 @@ on:
     paths:
       - "cnwebsite/**"
       - "cndocs/**"
+      - ".github/workflows/gh-pages.yml"
 
 jobs:
   deploy:

package.json

@@ -6,7 +6,7 @@
     "node": ">=22"
   },
   "workspaces": [
-    "website",
+    "cnwebsite",
     "packages/*",
     "plugins/*"
   ],