feat: initialize FastAPI application structure and implement thumbnail service

Author: jschm42

app/main.py

@@ -4222,6 +4222,17 @@ async def upload_session_input_image(
             status_code=400,
         )
 
+    # Auto-rotate / transpose EXIF orientation if applicable
+    try:
+        with Image.open(io.BytesIO(data)) as img:
+            fmt = img.format or "JPEG"
+            transposed = ImageOps.exif_transpose(img)
+            buffer = io.BytesIO()
+            transposed.save(buffer, format=fmt)
+            data = buffer.getvalue()
+    except Exception as exc:
+        logger.warning(f"Failed to auto-rotate uploaded image: {exc}")
+
     crud.upsert_chat_session_preferences(session, chat_session_id=token)
 
     session_subdir = _session_input_subdir(token)

app/services/thumbnail_service.py

@@ -26,8 +26,11 @@ def create_thumbnail(self, base_dir: Path, image_relative_path: str | Path) -> P
         thumbnail_rel = self.thumbnail_relative_path(image_relative_path)
         thumbnail_abs = self.storage_service.resolve_managed_path(base_dir, thumbnail_rel)
 
+        from PIL import ImageOps
+
         with Image.open(image_abs) as source:
-            image = source.convert("RGB")
+            transposed = ImageOps.exif_transpose(source)
+            image = transposed.convert("RGB")
             image.thumbnail((self.max_px, self.max_px))
             buffer = BytesIO()
             image.save(buffer, format="WEBP", quality=85)