Fix/api key concurrency runtime miss (#309)

* test(cli): 覆盖 API key 并发等待与超时路径

* feat(scheduler): API key 并发饱和时等待可用槽位

* fix(proxy): 区分 API key 并发受限与真正的 runtime miss

* fix(outcome): runtime miss 仅归因真实执行候选

* feat(api-keys): 统一 concurrent_limit 默认值与校验辅助

* feat(admin): 独立 Key 接口支持 concurrent_limit

* feat(admin): 用户 API Key 路由支持 concurrent_limit

* feat(public): 自助 API Key 路由支持 concurrent_limit

* feat(import): 导入与存储层持久化 concurrent_limit

* feat(frontend): 同步 API Key concurrent_limit 类型定义

* feat(frontend): 独立 Key 表单支持 concurrent_limit

* feat(frontend): 管理员用户 API Key 表单支持 concurrent_limit

* feat(frontend): 自助 API Key 页面支持 concurrent_limit

* chore(fmt): 统一 runtime 归因相关 Rust 格式

* chore(fmt): 统一 admin API key 路由 Rust 格式

* chore(fmt): 统一 public 路由与相关测试 Rust 格式

* fix(test): 对齐 no-execution usage 归因断言

* test(middleware): 固定 access log tracing 用例线程模型

* fix(frontend): 提取用户 API Key payload 默认并发辅助

* fix(frontend): 保留用户 Key 的 concurrent_limit 默认值

* fix(api-keys): remove hardcoded concurrent limit default

---------

Co-authored-by: fawney19 <elky0401@gmail.com>

apps/aether-gateway/src/scheduler/candidate/tests/selection.rs

@@ -23,7 +23,7 @@ use super::super::runtime::should_skip_provider_quota;
 use super::super::selection::{
     collect_selectable_candidates as collect_selectable_candidates_impl,
     collect_selectable_candidates_with_skip_reasons as collect_selectable_candidates_with_skip_reasons_impl,
-    select_minimal_candidate as select_candidate_impl,
+    is_exact_all_skipped_by_auth_limit, select_minimal_candidate as select_candidate_impl,
 };
 use super::support::{sample_auth_snapshot, sample_key, sample_provider, sample_row};
 
@@ -914,6 +914,23 @@ async fn returns_none_when_auth_api_key_concurrent_limit_is_reached() {
     .expect("selection should succeed");
 
     assert!(selected.is_none());
+
+    let (selected_candidates, skipped_candidates) =
+        collect_selectable_candidates_with_skip_reasons(
+            state.data.as_ref(),
+            &state,
+            "openai:chat",
+            "gpt-4.1",
+            false,
+            Some(&auth_snapshot),
+            100,
+        )
+        .await
+        .expect("selection should succeed");
+    assert!(is_exact_all_skipped_by_auth_limit(
+        &selected_candidates,
+        &skipped_candidates,
+    ));
 }
 
 #[tokio::test]
@@ -1138,6 +1155,7 @@ async fn exposes_runtime_skipped_candidates_with_skip_reasons() {
     assert_eq!(skipped.len(), 1);
     assert_eq!(skipped[0].candidate.provider_id, "provider-a");
     assert_eq!(skipped[0].skip_reason, "key_circuit_open");
+    assert!(!is_exact_all_skipped_by_auth_limit(&selected, &skipped));
 }
 
 #[tokio::test]