ci: install baoyu-post-to-wechat script deps before running tests

`wechat-socks-http.test.ts` (and `wechat-remote-publish.test.ts`
transitively) import `socks` from `wechat-socks-http.ts`. The CI
`npm ci` only installs root deps, so module resolution failed with
`ERR_MODULE_NOT_FOUND: Cannot find package 'socks'`.

Add a scoped `npm install` step for `skills/baoyu-post-to-wechat/scripts/`
with `--ignore-scripts` to skip postinstalls. Other skills with
private script package.json files don't yet have tests that import
their deps, so leaving them out keeps the install fast.

Co-authored-by: Dame5211 <1079825614@qq.com>

.github/workflows/test.yml

@@ -26,5 +26,10 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Install baoyu-post-to-wechat script dependencies
+        run: |
+          cd skills/baoyu-post-to-wechat/scripts
+          npm install --no-audit --no-fund --ignore-scripts
+
       - name: Run tests
         run: npm test