### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

Sending a `POST /v1/images/edits` request with `image`, `mask`, `prompt`, `size`, and `response_format` through the LiteLLM proxy to an OpenAI model results in 500 with:

``` litellm.InternalServerError: InternalServerError: OpenAIException - Attempted to access streaming request content, without having called `read()`. ```

The request is well-formed multipart/form-data with a single image file and a single mask file (both PNG). The error occurs consistently on every retry (2 retries attempted).

This appears to be an `httpx.RequestNotRead` exception surfacing inside the image edit handler — the proxy seems to try accessing the streamed request body without calling `.read()` first.

**Expected behavior:** The proxy should forward the multipart form data to OpenAI's `/v1/images/edits` endpoint and return the edited image as `b64_json`.

### Steps to Reproduce

```bash curl -X POST "https://<litellm-proxy>/v1/images/edits" \ -H "Authorization: Bearer <api-key>" \ -F "model=<openai-model-group>" \ -F "image=@photo.png" \ -F "mask=@mask.pn…