robin dd27cfe0e7 feat: implement API usage tracking and admin dashboard ...

- Added database schema for API tracking system:
  * api_usage table - tracks all Google Search and Gemini AI calls
  * user_credits table - prepared for future credits system
  * admin_users table - controls admin dashboard access
- Created comprehensive tracking service (track-api-usage.ts):
  * trackApiUsage() - records API calls with success/failure
  * checkDailyLimit() - enforces 80 Google Search calls/day limit
  * getUserApiStats() - per-user statistics
  * getGlobalApiStats() - app-wide statistics (admin only)
  * checkIsAdmin() - server-side authorization
- Integrated tracking into discover-whiskybase.ts:
  * Pre-call limit checking with friendly error messages
  * Post-call usage tracking for success and failures
  * User authentication verification
- Built admin dashboard at /admin:
  * Global statistics cards (total, today, by API type)
  * Top 10 users by API usage
  * Recent activity log with 50 latest calls
  * Color-coded status indicators
  * Secure access with RLS policies
- Features:
  * Daily limit resets at midnight Europe/Berlin timezone
  * Graceful error handling (allows on tracking failure)
  * Comprehensive indexes for fast queries
  * Ready for future credits/monetization system

2025-12-18 13:56:21 +01:00

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