fix: add cost field to QueryResponse

app.py

@@ -43,6 +43,7 @@ class QueryResponse(BaseModel):
     credits_remaining: int
     complexity: Optional[dict] = None
     retrieval_source: Optional[str] = None
+    cost: Optional[dict] = None
 
 @app.get("/")
 def root(): return {"status": "ACRA API is live \U0001F680", "docs": "/docs"}
@@ -79,6 +80,7 @@ async def query(body: QueryRequest,
         credits_remaining = remaining,
         complexity        = result.get("complexity"),
         retrieval_source  = result.get("retrieval_source"),
+        cost              = result.get("cost"),
     )
 
 @app.get("/v1/usage")