Fix OIDC email: load Authelia profile from UserInfo

Auth.js OIDC only reads ID-token claims by default; Authelia puts
email on UserInfo. Set idToken:false, harden claim extraction, and
document an optional Authelia claims_policy.

README.md

@@ -67,8 +67,26 @@ Open http://localhost:3000 and sign in.
 6. Open `/login` — you should see **Sign in with AtlasHorizon**.
 
 Notes:
-- `AUTH_OIDC_ISSUER` must match discovery (`{issuer}/.well-known/openid-configuration`). Your AtlasHorizon issuer at `https://auth.atlashorizon.net` is valid.
-- The IdP must return an **email** claim (we request `openid email profile`).
+- `AUTH_OIDC_ISSUER` must match discovery (`{issuer}/.well-known/openid-configuration`).
+- The app requests `openid email profile` and loads profile from **UserInfo** (Authelia puts `email` there by default).
+- Optional Authelia hardening — also put email on the ID token:
+
+```yaml
+identity_providers:
+  oidc:
+    claims_policies:
+      rfiddb:
+        id_token:
+          - 'email'
+          - 'email_verified'
+          - 'preferred_username'
+          - 'name'
+    clients:
+      - client_id: 'rfiddb'
+        claims_policy: 'rfiddb'
+        # ...rest of client...
+```
+
 - Local password login stays available alongside SSO.
 - If the button is missing, you are almost certainly on an old image — rebuild.