TokenTailsCat REST API

• Health: /health
• Create user: /api/user/create?username=player_123
• Get user: /api/user/player_123
• Fund contract: /api/contract/fund?amount=0.5
• Mint (auto ID): /api/mint?username=player_123
• Mint (pick range): /api/mint?username=player_123&startId=1&scanLimit=1000
• Check-in: /api/checkin?username=player_123&tokenId=42