fix: replace GZipMiddleware with StreamingResponse for efficient file streaming

app.py

@@ -25,7 +25,7 @@ import numpy as np
 import torch
 from fastapi import FastAPI, File, HTTPException, Response, UploadFile, BackgroundTasks
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.middleware.gzip import GZipMiddleware
+from fastapi.responses import StreamingResponse
 from fastapi.staticfiles import StaticFiles
 from PIL import Image
 from transformers import (
@@ -217,7 +217,6 @@ def _load_intrinsic_model():
 
 
 app = FastAPI()
-app.add_middleware(GZipMiddleware, minimum_size=1000)
 app.add_middleware(
     CORSMiddleware,
     allow_origins=["https://room-editor-9y3b.vercel.app"],
@@ -1143,10 +1142,12 @@ async def viz2d_job_file(job_id: str):
     bundle_path = JOB_DIR / f"{job_id}.bundle.json"
     if not bundle_path.exists():
         raise HTTPException(status_code=404, detail="Job output not found.")
-    return Response(
-        content=bundle_path.read_bytes(),
-        media_type="application/json",
-    )
+    def iter_file():
+        with open(bundle_path, "rb") as f:
+            while chunk := f.read(65536):
+                yield chunk
+
+    return StreamingResponse(iter_file(), media_type="application/json")
 
 
 @app.post("/segment")