token用量实时监控

@user_acdf755c/token-monitor

Monitor and analyze OpenClaw token usage across sessions. Shows models used, token counts (input/output/cache), daily trends, and hourly breakdowns. Use when the user asks about token usage, API consumption, cost tracking, model usage stats, token trends, or how many tokens have been used. Triggers: token usage, 用量, token统计, 消耗, cost, 花费, model usage, API usage.