Remove re-run functionality from import app
Simplify the import app by removing the ability to re-run imports with
different facet/setting parameters. The detail view is now read-only.
Changes:
- Remove /api/<timestamp>/rerun route and handler
- Remove re-run UI section, progress banner, and related JS from detail template
- Remove archive_imported_results() utility function
- Remove associated tests
- Clean up unused imports (datetime, time)
- Fix stale docstring path reference
~260 lines removed total.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>