first commit

backend/app/utils/file_storage.py

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+import uuid
+from pathlib import Path
+
+from app.core.config import settings
+
+
+def save_upload(data: bytes, case_id: str, filename: str) -> tuple[str, str]:
+    """Save uploaded file and return (file_path, thumb_path) relative to UPLOAD_DIR."""
+    case_dir = settings.upload_path / case_id
+    case_dir.mkdir(parents=True, exist_ok=True)
+
+    ext = Path(filename).suffix or ".png"
+    unique_name = f"{uuid.uuid4().hex}{ext}"
+    file_path = case_dir / unique_name
+    file_path.write_bytes(data)
+
+    relative = f"{case_id}/{unique_name}"
+    return relative, relative