v0.8.8

Team leaderboard goes live

Added

• The Team leaderboard is now live: /v1/leaderboard is deployed, so the Team dashboard shows real teammate rankings instead of the local-preview banner.
• Added achievement badges for auto-flip usage (First Flip, Flip Fluent, Flip Master, Autopilot) and for "copy text from screenshot" usage (Screen Reader, Copy Paste Pro, OCR Veteran).
• Added social/rank-based team achievements: Podium Finish, Top of the Board, Biggest Climber, and Most Improved.