feat: 余额预扣 reserve/capture、冷却兜底重试、Prometheus /metrics
- 预扣:每请求按 body 估算成本上界计入冻结额(1e-8 USD 原子计数),402 判定 改为「余额 - 在途冻结 ≤ 0」,并发的长流式请求不再互相透支;OT_PROXY_RESERVE_MAX_TOKENS 控制估算基数(默认 4096,0=关闭),handler defer 释放,失败/中断/panic 均覆盖 - 调度:全部候选都在运行期冷却时,剩余冷却 ≤ OT_PROXY_COOLDOWN_GRACE 的最早恢复渠道 兜底重试一次而不是 503(429 Retry-After 语义);DB 层不可用的渠道不参与兜底 - 指标:openteam_proxy_requests_total / request_duration / channel_failures / usage_queue_depth / frozen_balance,/metrics 默认关闭(OT_METRICS_ENABLED 开启)
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@@ -41,6 +41,8 @@ func serve() error {
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MaxBodyMB: cfg.Proxy.MaxBodyMB,
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FailoverBudget: cfg.Proxy.FailoverBudget,
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FailoverSwitchCaps: cfg.Proxy.FailoverSwitchCaps,
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CooldownGrace: cfg.Proxy.CooldownGrace,
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ReserveMaxTokens: cfg.Proxy.ReserveMaxTokens,
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StreamHeartbeat: cfg.Proxy.StreamHeartbeat,
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FirstTokenWait: cfg.Proxy.FirstTokenWait,
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AffinityTTL: cfg.Proxy.AffinityTTL,
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