refactor(api-key): Inject Ghost API key at build time

.gitea/workflows/deploy.yml

@@ -16,9 +16,11 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'pnpm'
       - name: Install dependencies
         run: pnpm install
+      - name: Create Ghost Config
+        run: |
+          echo "window.GhostConfig = { ghostApiKey: '${{ secrets.GHOST_CONTENT_API_KEY }}', ghostApiUrl: '${{ secrets.GHOST_ADMIN_API_URL }}' };" > assets/js/ghost-config.js
       - name: Build theme
         run: pnpm build
       - name: Deploy Ghost Theme