fix(accounts): preserve quota forecast totals on same-window reversals (#414)

* fix(accounts): preserve quota forecast totals on same-window reversals

Share exhausted-window recovery evidence between account recovery and
forecast sampling. Keep recorded cycle usage on ordinary reversals and
restart totals only after the recovery evidence is satisfied.

Co-authored-by: Codex <noreply@openai.com>

* fix(accounts): separate forecast cycle boundaries from quota recovery

Keep same-window usage totals after quota reversals, including observations near exhaustion. Leave access recovery in the OpenAI provider and reset forecast totals only at an identified window or plan boundary.

Co-authored-by: Codex <noreply@openai.com>

---------

Co-authored-by: Zyy <zyycn@users.noreply.github.com>
Co-authored-by: Codex <noreply@openai.com>

docs/architecture.md

@@ -885,6 +885,7 @@ OpenAI 订阅周期属于按需个人信息，不是额度事实。Admin 账号
 
 - 同一额度窗口内，每累计至少 5 个百分点形成一段，使用最近 3 个完整段及尾部计算合并比值，不平均逐请求的小分母比值
 - 重复读数不增加段数，大于 1 个百分点的额度回落、累计计数倒退或窗口身份变化会中断采样
+- 同窗口回落保留已记录累计；触顶后恢复可用不代表新周期，不能据此重设累计基线
 - OpenAI 的窗口匹配复用限流解析器，核对桶、槽位、时长和明确套餐，只容许最多 2 秒的重置时间抖动
 - 重置后从新段重新累计，无法精确归属的用量不补算；只有账号在窗口开始前加入且无已知断点时，才允许以窗口累计量替代增量采样
 - 历史点抽样不缩减区间累计用量，同一完成时间共用同一累计值