feat(stream-bridge): 支持上游 sync 响应转 SSE 流式输出，记录 client/upstream 流模式差异

- 新增 sync_to_stream 桥接模块，将非 SSE 上游响应转换为 SSE 格式回传给流式客户端
- stream_pump 检测非 SSE 响应头后缓冲整包并通过桥接逻辑重写为 SSE 帧
- proxy handler 同步支持 sync→stream 聚合与转换（覆盖 openai/claude/gemini 四种格式）
- sync_products 补全 openai:cli 的完整流式事件聚合（text delta、reasoning、tool call 等）
- usage runtime 写入 client_requested_stream / upstream_is_stream 到 request_metadata
- SQL 查询层将两个布尔字段从 request_metadata jsonb 中提取并回传给前端
- 前端 status.ts 新增 resolveUsageStreamLabelSegments，优先读取 client_requested_stream
- RequestDetailDrawer 在流式转换场景下显示"客户端→上游"两段 Badge

apps/aether-gateway/src/ai_pipeline/planner/passthrough/provider/family/payload.rs

@@ -101,7 +101,11 @@ pub(crate) async fn maybe_build_local_same_format_provider_decision_payload_for_
                 original_headers: &parts.headers,
                 original_request_body_json: Some(body_json),
                 original_request_body_base64: None,
-                client_requested_stream: spec_metadata.require_streaming,
+                client_requested_stream: body_json
+                    .get("stream")
+                    .and_then(serde_json::Value::as_bool)
+                    .unwrap_or(false),
+                upstream_is_stream: resolved.upstream_is_stream,
                 has_envelope: resolved.is_kiro || resolved.is_antigravity,
                 needs_conversion: false,
                 extra_fields,

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

@@ -27,6 +27,7 @@ pub(crate) struct LocalExecutionReportContextParts<'a> {
     pub(crate) original_request_body_json: Option<&'a Value>,
     pub(crate) original_request_body_base64: Option<&'a str>,
     pub(crate) client_requested_stream: bool,
+    pub(crate) upstream_is_stream: bool,
     pub(crate) has_envelope: bool,
     pub(crate) needs_conversion: bool,
     pub(crate) extra_fields: Map<String, Value>,
@@ -122,6 +123,10 @@ pub(crate) fn build_local_execution_report_context(
         "client_requested_stream".to_string(),
         Value::Bool(parts.client_requested_stream),
     );
+    object.insert(
+        "upstream_is_stream".to_string(),
+        Value::Bool(parts.upstream_is_stream),
+    );
     object.insert("has_envelope".to_string(), Value::Bool(parts.has_envelope));
     object.insert(
         "needs_conversion".to_string(),

apps/aether-gateway/src/ai_pipeline/planner/specialized/files/decision.rs

@@ -87,6 +87,7 @@ pub(super) async fn maybe_build_local_gemini_files_decision_payload_for_candidat
         original_request_body_json: Some(body_json),
         original_request_body_base64: resolved.provider_request_body_base64.as_deref(),
         client_requested_stream: spec_metadata.require_streaming,
+        upstream_is_stream: spec_metadata.require_streaming,
         has_envelope: false,
         needs_conversion: false,
         extra_fields,

apps/aether-gateway/src/ai_pipeline/planner/specialized/image/decision.rs

@@ -79,6 +79,7 @@ pub(super) async fn maybe_build_local_openai_image_decision_payload_for_candidat
         original_request_body_json: Some(body_json),
         original_request_body_base64: body_base64,
         client_requested_stream: spec_metadata.require_streaming,
+        upstream_is_stream: spec_metadata.require_streaming,
         has_envelope: false,
         needs_conversion: false,
         extra_fields,

apps/aether-gateway/src/ai_pipeline/planner/specialized/video/decision.rs

@@ -70,6 +70,7 @@ pub(super) async fn maybe_build_local_video_create_decision_payload_for_candidat
         original_request_body_json: Some(body_json),
         original_request_body_base64: None,
         client_requested_stream: false,
+        upstream_is_stream: false,
         has_envelope: false,
         needs_conversion: false,
         extra_fields,

apps/aether-gateway/src/ai_pipeline/planner/standard/family/payload.rs

@@ -75,7 +75,11 @@ pub(super) async fn maybe_build_local_standard_decision_payload_for_candidate(
                 original_headers: &parts.headers,
                 original_request_body_json: Some(body_json),
                 original_request_body_base64: None,
-                client_requested_stream: spec_metadata.require_streaming,
+                client_requested_stream: body_json
+                    .get("stream")
+                    .and_then(serde_json::Value::as_bool)
+                    .unwrap_or(false),
+                upstream_is_stream: resolved.upstream_is_stream,
                 has_envelope: false,
                 needs_conversion: true,
                 extra_fields,

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

@@ -92,7 +92,11 @@ pub(crate) async fn maybe_build_local_openai_chat_decision_payload_for_candidate
                 original_headers: &parts.headers,
                 original_request_body_json: Some(body_json),
                 original_request_body_base64: None,
-                client_requested_stream: upstream_is_stream,
+                client_requested_stream: body_json
+                    .get("stream")
+                    .and_then(serde_json::Value::as_bool)
+                    .unwrap_or(false),
+                upstream_is_stream,
                 has_envelope: false,
                 needs_conversion: matches!(
                     resolved.conversion_mode,

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

@@ -96,7 +96,11 @@ pub(crate) async fn maybe_build_local_openai_cli_decision_payload_for_candidate(
                 original_headers: &parts.headers,
                 original_request_body_json: Some(body_json),
                 original_request_body_base64: None,
-                client_requested_stream: spec_metadata.require_streaming,
+                client_requested_stream: body_json
+                    .get("stream")
+                    .and_then(serde_json::Value::as_bool)
+                    .unwrap_or(false),
+                upstream_is_stream: resolved.upstream_is_stream,
                 has_envelope: resolved.is_antigravity,
                 needs_conversion: matches!(
                     resolved.conversion_mode,