fix(ci): disable pnpm caching due to path resolution issues

The setup-node action fails to cache pnpm dependencies because the
store path /workspace/kempersc/glam/.pnpm-store/v3 can't be resolved.
Disabling caching for now to get the build working.

.forgejo/workflows/deploy-frontend.yml

@@ -54,8 +54,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.NODE_VERSION }}
-          cache: 'pnpm'
-          cache-dependency-path: frontend/pnpm-lock.yaml
+          # Note: pnpm caching disabled due to path resolution issues with Forgejo runner
 
       - name: Install dependencies
         working-directory: frontend