yumoqing 354f556099 feat: 新增 llm_metrics 和 user_llm_policy 两张表
llm_metrics: 从 llmusage 抽取的轻量指标表
- userid, llmid, use_date, input/output/total tokens
- amount, responsed_seconds, finish_seconds

user_llm_policy: 用户模型策略(customer.admin 管理)
- 每个用户每个模型可单独设限
- daily/monthly_call_limit, spending_alert/ceiling, max_concurrency
- 缺省空=不限
- orgid+userid+llmid 唯一约束

菜单新增: 用户模型策略、模型使用指标
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