Cross-account bulk audit and hourly monitoring

Added

• Bulk audit across every connected account in one run, with a roll-up health score.
• Hourly monitoring on Enterprise, with anomaly alerts between scans.
• Cross-account view with sortable health, spend, CPA and ROAS columns.

Improved

• Health score now weights tracking failures more aggressively.
• PDF reports include a projected-savings summary on page one.