fix: optimize file reading in viz2d_job_file by reading entire file at once

app.py

@@ -1149,8 +1149,8 @@ async def viz2d_job_file(job_id: str):
         raise HTTPException(status_code=404, detail="Job output not found.")
     async def iter_file():
         async with aiofiles.open(bundle_path, "rb") as f:
-            while chunk := await f.read(65536):
-                yield chunk
+            data = await f.read()
+        yield data
 
     return StreamingResponse(iter_file(), media_type="application/json")