fix image orientation

app/images.py

@@ -6,7 +6,7 @@ import subprocess
 from tempfile import TemporaryDirectory
 
 from fastapi import HTTPException, UploadFile
-from PIL import Image, UnidentifiedImageError
+from PIL import Image, ImageOps, UnidentifiedImageError
 
 try:
     from pillow_heif import register_heif_opener
@@ -59,7 +59,9 @@ def process_upload(file: UploadFile | None) -> ProcessedImage | None:
 
 
 def _prepare_image(source_image: Image.Image) -> ProcessedImage:
-    prepared = _strip_metadata_and_convert(source_image)
+    # Normalize orientation from EXIF before resizing or stripping metadata.
+    prepared = ImageOps.exif_transpose(source_image)
+    prepared = _strip_metadata_and_convert(prepared)
     prepared.thumbnail((MAX_IMAGE_SIDE, MAX_IMAGE_SIDE))
 
     output = BytesIO()