Add unified input provenance helper

[yoshifuminakamura]

Summary

• Add a single bk_record_input helper that records input facts from parameters, command arguments, repository URLs, paths, and pre-staged dataset hints.
• Move application examples to that common helper instead of app-local JSON or typed helper selection.
• Keep source URL recording separate from public reuse eligibility checks.
• Add a common Result JSON step that confirms github.com and gitlab.com repository visibility with anonymous provider APIs before adding public_access_check metadata.
• Strip app-supplied public-access flags before Result JSON publication, require the confirmation host to match the exported URL host, and treat unconfirmed URLs as non-public for reuse export.
• Accept parameter-only self-contained input in Portal summaries.

Validation

• bash -n scripts/result.sh scripts/bk_functions.sh scripts/tests/test_result_common_json_contract.sh scripts/tests/test_bk_input_info.sh programs/genesis/run.sh programs/petsc-gmres/run.sh programs/qws/run.sh programs/salmon/run.sh programs/scale-letkf/run.sh
• shellcheck -S error -f gcc scripts/result.sh scripts/bk_functions.sh scripts/tests/test_result_common_json_contract.sh scripts/tests/test_bk_input_info.sh programs/genesis/run.sh programs/petsc-gmres/run.sh programs/qws/run.sh programs/salmon/run.sh programs/scale-letkf/run.sh
• bash scripts/tests/test_bk_input_info.sh
• bash scripts/tests/test_result_common_json_contract.sh
• python -m py_compile result_server/utils/result_records.py result_server/utils/public_reuse.py result_server/utils/evidence_packet.py result_server/utils/evidence_snapshot.py result_server/tests/test_results_loader.py result_server/tests/test_public_result_routes.py result_server/tests/test_evidence_snapshot.py

Note: pytest route tests were not run locally because the local Python environment is missing test dependencies; CI will cover them.