[feature] add the code for next-authz

[hsluoyz]

need to develop the Next.js middleware for casbin in this repo

needs to have code (apache header year is 2026) and unit tests

need to have CI (use semantic-release and below trigger)

To:

on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

CI only needs to run against Node.js 24 LTS

need to have a README (with badges)

about how to implement, refer to a similar repo: https://github.com/node-casbin/typeorm-adapter

[hsluoyz]

@nodece @Shivansh-yadav13