feat: 新增 frontdoor 执行回环守卫与多项可观测性增强

- 新增 frontdoor_loop_guard 模块，检测并拒绝 execution runtime 回环到本地网关的请求（HTTP 508）
- candidate loop 引入 span tracking、执行尝试日志与流式看门狗超时
- 本地故障转移策略支持从 report_context 加载，新增 append_local_failover_policy_to_value
- runtime tracing 美化：移除 identity 前缀，按 span 深度树形缩进，target 固定宽度展示
- Codex OpenAI CLI 补齐 chatgpt-account-id/x-client-request-id/session_id/conversation_id 请求头
- OpenAI CLI same/cross-format 聚合规则放宽以支持 openai:compact 客户端格式，并过滤 error-like 响应体
- auth/proxy/finalize 日志补充 user_id/api_key_id/api_key_name/balance_remaining 等字段
- 启动日志拆分为 starting/ready/config 三段，新增 resolve_bind_http_base_url
- access_log middleware 将生成的 trace_id 回注到下游请求头
- Cargo.toml 启用 serde_json preserve_order 特性

apps/aether-gateway/src/tests/ai_execute/finalize_local.rs

@@ -124,7 +124,7 @@ async fn gateway_executes_openai_chat_sync_upstream_stream_via_local_finalize_re
         .with_transport_fields(
             true,
             false,
-            false,
+            true,
             None,
             Some(2),
             None,
@@ -614,7 +614,7 @@ async fn gateway_executes_openai_chat_cross_format_upstream_stream_via_local_fin
         .with_transport_fields(
             true,
             false,
-            false,
+            true,
             None,
             Some(2),
             None,
@@ -861,9 +861,12 @@ async fn gateway_executes_openai_chat_cross_format_upstream_stream_via_local_fin
         .await
         .expect("request should succeed");
     let elapsed = started_at.elapsed();
+    let response_status = response.status();
+    let response_body = response.text().await.expect("body should read");
 
-    assert_eq!(response.status(), StatusCode::OK);
-    let response_json: serde_json::Value = response.json().await.expect("body should parse");
+    assert_eq!(response_status, StatusCode::OK);
+    let response_json: serde_json::Value =
+        serde_json::from_str(&response_body).expect("body should parse");
     assert_eq!(
         response_json,
         json!({
@@ -1047,7 +1050,7 @@ async fn gateway_executes_openai_chat_cross_format_tool_use_upstream_stream_via_
         .with_transport_fields(
             true,
             false,
-            false,
+            true,
             None,
             Some(2),
             None,
@@ -1311,9 +1314,12 @@ async fn gateway_executes_openai_chat_cross_format_tool_use_upstream_stream_via_
         .await
         .expect("request should succeed");
     let elapsed = started_at.elapsed();
+    let response_status = response.status();
+    let response_body = response.text().await.expect("body should read");
 
-    assert_eq!(response.status(), StatusCode::OK);
-    let response_json: serde_json::Value = response.json().await.expect("body should parse");
+    assert_eq!(response_status, StatusCode::OK);
+    let response_json: serde_json::Value =
+        serde_json::from_str(&response_body).expect("body should parse");
     assert_eq!(
         response_json,
         json!({
@@ -1497,7 +1503,7 @@ async fn gateway_skips_openai_chat_antigravity_cross_format_sync_candidate_as_tr
         .with_transport_fields(
             true,
             false,
-            false,
+            true,
             None,
             Some(2),
             None,
@@ -1857,7 +1863,7 @@ async fn gateway_executes_openai_chat_cross_format_claude_upstream_sync_via_loca
         .with_transport_fields(
             true,
             false,
-            false,
+            true,
             None,
             Some(2),
             None,
@@ -2064,9 +2070,12 @@ async fn gateway_executes_openai_chat_cross_format_claude_upstream_sync_via_loca
         .await
         .expect("request should succeed");
     let elapsed = started_at.elapsed();
+    let response_status = response.status();
+    let response_body = response.text().await.expect("body should read");
 
-    assert_eq!(response.status(), StatusCode::OK);
-    let response_json: serde_json::Value = response.json().await.expect("body should parse");
+    assert_eq!(response_status, StatusCode::OK);
+    let response_json: serde_json::Value =
+        serde_json::from_str(&response_body).expect("body should parse");
     assert_eq!(
         response_json,
         json!({
@@ -2205,7 +2214,7 @@ async fn gateway_executes_openai_chat_cross_format_gemini_upstream_sync_via_loca
         .with_transport_fields(
             true,
             false,
-            false,
+            true,
             None,
             Some(2),
             None,