Get Analytics Overview

Get high-level analytics overview.

Returns aggregated system metrics:

• total_users: Total registered users
• onboarding_completion: Percentage of users who completed onboarding
• story_creators: Percentage of users who created at least one story
• audiobook_creators: Percentage of users who created at least one audiobook
• both_creators: Percentage of users who created both stories and audiobooks

Returns: Overview metrics: { "total_users": 12345, "onboarding_completion": 78.5, "story_creators": 45.2, "audiobook_creators": 32.1, "both_creators": 15.8 }