fix: bug

app/schemas.py

@@ -1,3 +1,5 @@
+from typing import Any
+
 from pydantic import BaseModel, Field
 
 
@@ -16,6 +18,10 @@ class RewriteResponse(BaseModel):
     body_markdown: str
     mode: str = "ai"
     quality_notes: list[str] = []
+    trace: dict[str, Any] | None = Field(
+        default=None,
+        description="改写链路追踪：请求 ID、耗时、模型、质检与降级原因，便于监测与回溯",
+    )
 
 
 class WechatPublishRequest(BaseModel):