Implement content moderation review interface

Integrate content moderation review interface into dashboard.

Features:

• View flagged content from moderation API
• Review and action interface
• Moderation queue management
• Appeal handling
• Moderator activity logs

Implementation:

• Integrate with content moderation API
• Design review interface
• Add filtering and sorting
• Implement action workflows
• Add user context sidebar
• Notification system for new flags

Dependencies: Relates to ai-content-moderation issue #2 (closed)

Access Control:

• Role-based access (moderators only)
• Audit logging
• Action history