ci: remove problematic ls command that causes Woodpecker parsing failure

Remove 'ls -la node_modules/ | head -20' command that was causing
Woodpecker CI to fail with 'No pipeline steps available!' error.

This command may have special characters or output format that Woodpecker
cannot parse properly.

.woodpecker.yml

@@ -126,8 +126,6 @@ steps:
       - echo "=== Debug: Environment info ==="
       - node --version
       - npm --version
-      - echo "=== Debug: Checking node_modules ==="
-      - ls -la node_modules/ | head -20
       - echo "=== Debug: Cleaning cache ==="
       - rm -rf node_modules/.cache
       - rm -rf .next