refactor: 移除独立 hub/proxy/executor/gateway crate，统一为 gateway tunnel 架构

- 删除 aether-hub、aether-proxy 独立项目及其 Dockerfile/配置
- 删除 crates/aether-executor 和 crates/aether-gateway 全部模块
- 新增 apps/ 目录作为应用入口
- 将 hub 概念重构为 gateway tunnel transport
- 将 executor 重构为 execution runtime
- 新增 tunnel.rs 合约定义和 testkit tunnel/execution_runtime 模块
- 更新 Python 服务层和测试适配新架构命名

apps/aether-gateway/src/handlers/admin/wallets.rs

@@ -0,0 +1,25 @@
+use super::*;
+
+use sqlx::Row;
+
+#[path = "wallets/routes.rs"]
+mod admin_wallets_routes;
+#[path = "wallets/shared.rs"]
+mod admin_wallets_shared;
+#[path = "wallets/mutations.rs"]
+mod mutations;
+#[path = "wallets/reads.rs"]
+mod reads;
+
+pub(crate) async fn maybe_build_local_admin_wallets_response(
+    state: &AppState,
+    request_context: &GatewayPublicRequestContext,
+    request_body: Option<&axum::body::Bytes>,
+) -> Result<Option<Response<Body>>, GatewayError> {
+    admin_wallets_routes::maybe_build_local_admin_wallets_routes_response(
+        state,
+        request_context,
+        request_body,
+    )
+    .await
+}