ci: add dist/ verification step in GitHub Actions

ci: force push full repo including dist/ to HF Spaces

ci: improve GH Actions workflow - patch README + better error message

fix: workflow now validates HF_TOKEN secret before pushing

ci: workflows ready — add HF_TOKEN secret in GitHub to activate

fix: update deployer app with new HF token + clean workflow

ci: add GitHub Actions workflow to auto-sync to HF Spaces