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/tests/frontdoor/public_support.rs

@@ -6206,6 +6206,7 @@ async fn gateway_handles_users_me_api_key_writes_locally_without_proxying_upstre
         .to_string();
     assert_eq!(create_payload["name"], "writer-key");
     assert_eq!(create_payload["rate_limit"], 120);
+    assert_eq!(create_payload["concurrent_limit"], serde_json::Value::Null);
     assert_eq!(create_payload["message"], "API密钥创建成功");
     assert!(create_payload["key"]
         .as_str()
@@ -6219,7 +6220,8 @@ async fn gateway_handles_users_me_api_key_writes_locally_without_proxying_upstre
         .header("user-agent", "AetherTest/1.0")
         .json(&json!({
             "name": "writer-key-renamed",
-            "rate_limit": 30
+            "rate_limit": 30,
+            "concurrent_limit": 4
         }))
         .send()
         .await
@@ -6231,6 +6233,7 @@ async fn gateway_handles_users_me_api_key_writes_locally_without_proxying_upstre
         .expect("json body should parse");
     assert_eq!(update_payload["name"], "writer-key-renamed");
     assert_eq!(update_payload["rate_limit"], 30);
+    assert_eq!(update_payload["concurrent_limit"], 4);
     assert_eq!(update_payload["message"], "API密钥已更新");
 
     let toggle_response = client
@@ -6308,6 +6311,7 @@ async fn gateway_handles_users_me_api_key_writes_locally_without_proxying_upstre
         detail_payload["allowed_providers"],
         json!(["provider-openai"])
     );
+    assert_eq!(detail_payload["concurrent_limit"], 4);
     assert_eq!(detail_payload["force_capabilities"], json!({}));
 
     let delete_response = client