api/index.py

"""Vercel serverless entrypoint.

Exposes the existing Flask `app` from project root using the `api/` layout
required by Vercel Python runtime.
"""

import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from app import app  # noqa: E402,F401