cms0-better-auth-extensions

name	cms0-better-auth-extensions
description	Add or extend Better Auth plugins in cms0, including custom endpoints, server/client wiring, and adapter-backed access helpers.

CMS0 Better Auth Extensions

When adding custom Better Auth capabilities in cms0:

• Prefer createAuthEndpoint + sessionMiddleware for custom endpoints.
• Keep app-specific DB logic in the owning app and pass functions into plugin options.
• Keep shared plugin code in packages/auth/src/....
• If a client plugin is needed, expose it from packages/auth/src/...-client.ts.
• Keep final Better Auth composition in the owning app, not in packages/auth.

Checklist

1. Add schema changes in the owning app or shared schema package when needed.
2. Implement app-local DB helpers in the owning app.
3. Add or extend the shared plugin in packages/auth/src/....
4. Add a client plugin in packages/auth/src/...-client.ts if the UI needs it.
5. Wire the server auth composition in the owning app's auth module.
6. Update affected UI or route handlers to use the new endpoints cleanly.