fix: update Gitea mirror workflow to selectively remove scripts

- Only remove gitea-runner.sh instead of entire scripts directory
- Preserve useful deployment and utility scripts in GitHub mirror
- Update system metrics

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/mirror-to-github.yml

@@ -33,7 +33,7 @@ jobs:
           # Remove sensitive files/directories if they exist
           echo "Removing sensitive files..."
           rm -rf .gitea/ || true
-          rm -rf scripts/ || true
+          rm -rf scripts/gitea-runner.sh || true
           rm -rf .drone* || true
           rm -rf photo-sharing-prd.md || true
           rm -rf CLAUDE.md || true