Scanner fixes:
- Remove conflicting ``path`` from consent pre-seed cookie (Playwright
rejects cookies with both ``url`` and ``path``).
- Switch to ``networkidle`` + 5s + 2s delayed second-pass for reliable
cookie capture.
- Check sitemap Content-Type to skip SPA HTML fallbacks.
- Propagate ``auto_category`` from scan results to the cookies table
during sync (was silently dropped).
- Add ``_gcl_ls`` to the Open Cookie Database CSV.
- Classify ``_consentos_*`` cookies as necessary directly in the
classification engine.
- Add ``seed_known_cookies`` to the bootstrap init container command.
Admin UI:
- Add scan schedule control to the Scans tab — preset options
(disabled/daily/weekly/fortnightly/monthly) plus custom cron input.
Saves ``scan_schedule_cron`` on the site config.
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