fix(usage): 流式终端 usage 以更完整值为准，Codex CLI 显式选择 response 解析器

- 新增 StandardizedUsage::signal_score/is_more_complete_than/choose_more_complete，流式合并与终端落库均按信号完整度择优
- OpenAI Chat/CLI 解析器支持仅 usage 的终结 chunk 与 response.completed usage
- Codex provider 注入 provider_stream_event_api_format=openai:cli，解析器选择改由 report_context 显式决定
- usage_mapper 扩展嵌套 response/message/item 兼容 Claude message_start/message_delta 及 Gemini stream chunks
- usage SQL upsert 在终态（completed/failed/cancelled）时按 GREATEST 写入 token/费用镜像列

apps/aether-gateway/src/ai_pipeline/planner/report_context.rs

@@ -195,3 +195,53 @@ pub(crate) fn build_local_execution_report_context(
     object.extend(parts.extra_fields);
     Value::Object(object)
 }
+
+pub(crate) fn provider_stream_event_api_format_for_provider_type(
+    provider_type: &str,
+) -> Option<&'static str> {
+    match provider_type.trim().to_ascii_lowercase().as_str() {
+        "codex" => Some("openai:cli"),
+        _ => None,
+    }
+}
+
+pub(crate) fn insert_provider_stream_event_api_format(
+    extra_fields: &mut Map<String, Value>,
+    provider_type: &str,
+) {
+    if let Some(api_format) = provider_stream_event_api_format_for_provider_type(provider_type) {
+        extra_fields.insert(
+            "provider_stream_event_api_format".to_string(),
+            Value::String(api_format.to_string()),
+        );
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::provider_stream_event_api_format_for_provider_type;
+
+    #[test]
+    fn codex_provider_uses_openai_cli_stream_event_format() {
+        assert_eq!(
+            provider_stream_event_api_format_for_provider_type("codex"),
+            Some("openai:cli")
+        );
+        assert_eq!(
+            provider_stream_event_api_format_for_provider_type("CODEX"),
+            Some("openai:cli")
+        );
+    }
+
+    #[test]
+    fn ordinary_providers_do_not_override_stream_event_format() {
+        assert_eq!(
+            provider_stream_event_api_format_for_provider_type("openai"),
+            None
+        );
+        assert_eq!(
+            provider_stream_event_api_format_for_provider_type("anthropic"),
+            None
+        );
+    }
+}

apps/aether-gateway/src/ai_pipeline/planner/standard/openai/chat/decision/payload.rs

@@ -3,7 +3,8 @@ use crate::ai_pipeline::planner::payload_metadata::{
     build_local_execution_decision_response, LocalExecutionDecisionResponseParts,
 };
 use crate::ai_pipeline::planner::report_context::{
-    build_local_execution_report_context, LocalExecutionReportContextParts,
+    build_local_execution_report_context, insert_provider_stream_event_api_format,
+    LocalExecutionReportContextParts,
 };
 use crate::ai_pipeline::transport::{
     resolve_transport_execution_timeouts, resolve_transport_tls_profile,
@@ -75,6 +76,10 @@ pub(crate) async fn maybe_build_local_openai_chat_decision_payload_for_candidate
             serde_json::Value::String(envelope_name.to_string()),
         );
     }
+    insert_provider_stream_event_api_format(
+        &mut extra_fields,
+        resolved.transport.provider.provider_type.as_str(),
+    );
     let report_context = append_local_failover_policy_to_value(
         append_execution_contract_fields_to_value(
             build_local_execution_report_context(LocalExecutionReportContextParts {

apps/aether-gateway/src/ai_pipeline/planner/standard/openai/cli/decision/payload.rs

@@ -6,7 +6,8 @@ use crate::ai_pipeline::planner::payload_metadata::{
     build_local_execution_decision_response, LocalExecutionDecisionResponseParts,
 };
 use crate::ai_pipeline::planner::report_context::{
-    build_local_execution_report_context, LocalExecutionReportContextParts,
+    build_local_execution_report_context, insert_provider_stream_event_api_format,
+    LocalExecutionReportContextParts,
 };
 use crate::ai_pipeline::planner::spec_metadata::local_openai_cli_spec_metadata;
 use crate::ai_pipeline::transport::{
@@ -73,6 +74,10 @@ pub(crate) async fn maybe_build_local_openai_cli_decision_payload_for_candidate(
     if let Some(envelope_name) = resolved.envelope_name {
         extra_fields.insert("envelope_name".to_string(), json!(envelope_name));
     }
+    insert_provider_stream_event_api_format(
+        &mut extra_fields,
+        resolved.transport.provider.provider_type.as_str(),
+    );
     let report_context = append_local_failover_policy_to_value(
         append_execution_contract_fields_to_value(
             build_local_execution_report_context(LocalExecutionReportContextParts {