Adds the in-process observability + control infrastructure the admin
dashboard consumes:
- status.rs: CrawlerStatus/Phase/WorkerState + StatusHandle. The daemon
publishes its current phase (idle/walking/fetching-metadata/cover-backfill),
per-worker activity, and last-pass summary. Wired through the cron,
run_metadata_pass, and the worker loop.
- session_control.rs: SessionController refreshes PHPSESSID at runtime —
rewrites the shared reqwest cookie jar, updates the value on_launch reads,
persists to crawler_state (survives restart), and clears the expired flag.
on_launch now reads the live session instead of a startup snapshot.
- RealChapterDispatcher auto-triggers a coordinated browser restart after
CRAWLER_BROWSER_RESTART_THRESHOLD consecutive transient failures.
- repo::crawler: list_dead_jobs, requeue_dead_jobs (all/manga/job, bypassing
the quarantine, skipping live duplicates), job_state_counts.
- AppState gains CrawlerControl bundling browser_manager + session + status
+ metadata_pass for the admin endpoints.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
