feat(wordcloud): 收口在途开发（布局/存储/前端）+ R4 WCD 生产任务(jobs wcd_file)与生产订单列表

backend/service/schemas.py

@@ -17,6 +17,7 @@ class JobEvent(BaseModel):
     progress_percent: int = Field(ge=0, le=100)
     message: str
     timestamp: datetime
+    elapsed_seconds: float | None = None
 
 
 class JobStatus(BaseModel):
@@ -29,6 +30,7 @@ class JobStatus(BaseModel):
     updated_at: datetime
     artifacts: dict[str, str]
     error: str = ""
+    elapsed_seconds: float | None = None
 
 
 class JobDetail(BaseModel):
@@ -44,6 +46,7 @@ class JobResult(BaseModel):
     svg_stroke_url: str = ""
     db_url: str = ""
     metrics_url: str = ""
+    elapsed_seconds: float | None = None
 
 
 class WordLocation(BaseModel):