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docs(wiki): import verification and holds
docs: probe verification settings and the ffmpeg restart flag
docs: document ffmpeg config and media probe REST fields - Configuration Reference: new ffmpeg section (enabled/path semantics, graceful degrade), schedules.media_probe row, runtime-editable table entry - REST API: new Media probe section covering media_info, ffmpeg_warn, and GET/PATCH /config/ffmpeg - Scheduled Jobs: media-probe row in the jobs table
docs(wiki): add operating and advanced guides