fix(ci): 🐛 👷 build copy-markdown plugin before docs deploy

Run turbo build for docs dependencies so the workspace plugin dist exists
before Docusaurus deploy resolves @gracefullight/docusaurus-plugin-copy-markdown.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: gracefullight

.github/workflows/deploy-docs.yml

@@ -35,5 +35,7 @@ jobs:
           git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
       - name: INSTALL_PACKAGES
         run: bun install --frozen-lockfile
+      - name: BUILD_PACKAGES
+        run: bunx turbo run build --filter=@gracefullight/docusaurus-plugin-docs...
       - name: DEPLOY
         run: bun run --filter "@gracefullight/docusaurus-plugin-docs" deploy