adding the logic to generate the image

backend/app/api/qr.py

@@ -0,0 +1,16 @@
+from fastapi import APIRouter, HTTPException
+from fastapi.responses import Response
+
+from app.schemas.qr import QRRequest
+from app.services.qr_service import generate_qr_image_bytes
+
+router = APIRouter()
+
+
+@router.post("/generate")
+async def generate_qr(payload: QRRequest):
+    try:
+        img_bytes = generate_qr_image_bytes(payload.text, payload.size)
+        return Response(content=img_bytes, media_type="image/png")
+    except Exception as exc:  # pragma: no cover
+        raise HTTPException(status_code=500, detail=str(exc))