feat: crawler scaffold with chromium launcher (0.22.0)
- crawler module (browser, source trait, jobs, diff) + binary
- chromiumoxide launcher with fetcher feature (auto-downloads
Chromium on first run, caches under ~/.cache/mangalord/chromium)
- LaunchOptions struct with extra_args, parseable from
CRAWLER_BROWSER_MODE and CRAWLER_BROWSER_ARGS
- migration 0012 introduces sources, manga_sources,
chapter_sources, crawler_jobs
- integration tests for headed + headless launch, ipify load+parse,
and extra-args propagation (all #[ignore], opt-in)
26eccd0abe