feat: 扩展 Rust gateway 全功能模块，新增 billing/crypto/wallet crate 及完整数据层

- 新增 aether-billing、aether-crypto、aether-wallet 独立 crate
- aether-data 扩展 repository 层：announcements、auth_modules、billing、
  candidate_selection、gemini_file_mappings、global_models、management_tokens、
  oauth_providers、proxy_nodes、quota、users、wallet 等模块
- aether-gateway 新增 api/auth/billing/control/middleware/scheduler/usage/
  video_tasks/hooks/maintenance/model_fetch/provider_transport 等功能模块
- 重构 executor decision 和 gateway state 为模块目录结构
- 新增 gateway router、frontdoor 路由层及对应测试
- Python 侧 API 路由重构，新增 compat/support 模块
- 前端 Logo 组件更新及 Provider 管理页面调整

crates/aether-testkit/src/load.rs

@@ -7,18 +7,13 @@ use http::{HeaderMap, HeaderName, HeaderValue};
 use reqwest::{Client, Method};
 use tokio::sync::Mutex;
 
-#[derive(Debug, Clone, Copy, serde::Serialize, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, Default, serde::Serialize, PartialEq, Eq)]
 pub enum HttpLoadProbeResponseMode {
+    #[default]
     HeadersOnly,
     FullBody,
 }
 
-impl Default for HttpLoadProbeResponseMode {
-    fn default() -> Self {
-        Self::HeadersOnly
-    }
-}
-
 #[derive(Debug, Clone)]
 pub struct HttpLoadProbeConfig {
     pub url: String,