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/control/route/internal.rs

@@ -0,0 +1,49 @@
+use super::{classified, ClassifiedRoute};
+use crate::gateway::{is_tunnel_heartbeat_path, is_tunnel_node_status_path, TUNNEL_ROUTE_FAMILY};
+
+pub(super) fn classify_internal_route(
+    method: &http::Method,
+    normalized_path: &str,
+) -> Option<ClassifiedRoute> {
+    if method == http::Method::POST && normalized_path.starts_with("/api/internal/gateway/") {
+        let route_kind = match normalized_path {
+            "/api/internal/gateway/resolve" => "resolve",
+            "/api/internal/gateway/auth-context" => "auth_context",
+            "/api/internal/gateway/decision-sync" => "decision_sync",
+            "/api/internal/gateway/decision-stream" => "decision_stream",
+            "/api/internal/gateway/plan-sync" => "plan_sync",
+            "/api/internal/gateway/plan-stream" => "plan_stream",
+            "/api/internal/gateway/report-sync" => "report_sync",
+            "/api/internal/gateway/report-stream" => "report_stream",
+            "/api/internal/gateway/finalize-sync" => "finalize_sync",
+            "/api/internal/gateway/execute-sync" => "execute_sync",
+            "/api/internal/gateway/execute-stream" => "execute_stream",
+            _ => "legacy_gateway",
+        };
+        Some(classified(
+            "internal_proxy",
+            "gateway_legacy",
+            route_kind,
+            "",
+            false,
+        ))
+    } else if method == http::Method::POST && is_tunnel_heartbeat_path(normalized_path) {
+        Some(classified(
+            "internal_proxy",
+            TUNNEL_ROUTE_FAMILY,
+            "heartbeat",
+            "",
+            false,
+        ))
+    } else if method == http::Method::POST && is_tunnel_node_status_path(normalized_path) {
+        Some(classified(
+            "internal_proxy",
+            TUNNEL_ROUTE_FAMILY,
+            "node_status",
+            "",
+            false,
+        ))
+    } else {
+        None
+    }
+}