feat(adaptive): 完善自适应 RPM 学习并将 Pool 调度状态与健康分解耦

- orchestration 新增 AdaptiveSuccess 效果，在成功回报路径上根据利用率窗口扩张 learned_rpm_limit
- 429 路径改用 429_observation/adjustment 记录以及基于历史的置信度评估，新增 last_rpm_peak 边界字段
- Pool 调度状态不再因 health_score 低或熔断而降级/拦截，前端同步移除相关按钮与文案兜底
- 新增前端 poolTrace 工具（附测试）承接原 HorizontalRequestTimeline 内的候选合并逻辑

apps/aether-gateway/src/handlers/admin/request/system/adaptive.rs

@@ -139,6 +139,9 @@ impl<'a> AdminAppState<'a> {
         key.last_429_at_unix_secs = None;
         key.last_429_type = None;
         key.adjustment_history = None;
+        key.utilization_samples = None;
+        key.last_probe_increase_at_unix_secs = None;
+        key.last_rpm_peak = None;
         let Some(updated) = self.update_provider_catalog_key(&key).await? else {
             return Ok(admin_adaptive_key_not_found_response(key_id));
         };