Added demo access

README.md

@@ -103,6 +103,11 @@ The app includes an Express API in [backend/src/app.ts](/home/corey/github/Arsen
 - `ALLOW_REGISTRATION=true|false`
   - Controls whether `POST /api/auth/register` is available
   - When `false`, the login UI hides self-service account creation
+- `ALLOW_DEMO_ACCOUNT=true|false`
+  - Enables a backend-managed demo account and a demo sign-in button on the login page
+- `DEMO_ACCOUNT_EMAIL`
+- `DEMO_ACCOUNT_PASSWORD`
+- `DEMO_ACCOUNT_NAME`
 
 ### Response shape notes
 
@@ -167,6 +172,8 @@ Example:
   - Creates a local account when registration is enabled
 - `POST /api/auth/login`
   - Signs in with local email/password
+- `POST /api/auth/demo`
+  - Signs in to the configured demo account when demo mode is enabled
 - `POST /api/auth/logout`
   - Invalidates the current session token
 - `GET /api/auth/me`