Add admin moderation and analytics dashboards
Moderation Dashboard:
- API with admin-only access for content moderation
- View/filter reports by status (open, resolved, ignored)
- View/resolve contract disputes
- Manage flagged users (warn, ban, unban)
- Resolution notes for audit trail
- Stats for open reports, disputes, resolved today
Analytics Dashboard:
- Comprehensive platform metrics API
- User stats: total, new, active, creators
- Opportunity and application metrics
- Contract tracking and completion rates
- Revenue tracking by period
- Daily signup trend visualization
- Top performing opportunities ranking
- Period selector (7, 30, 90, 365 days)
Both dashboards have proper admin authorization checks.
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