Legacy GET /user/authenticate and GET /user/lookup_email were returning 404
because the backend has removed those routes. Updated all 5 auth functions in
ae_core__user.ts to use V3 equivalents:
- auth_ae_obj__username_password: GET /user/authenticate → POST /v3/action/user/authenticate (body)
- auth_ae_obj__user_id_user_auth_key: GET /user/authenticate → POST /v3/action/user/authenticate (body)
- send_email_auth_ae_obj__user_id: GET /user/{id}/email_auth_key_url → GET /v3/action/user/{id}/email_auth_key_url
- qry_ae_obj_li__user_email: GET /user/lookup_email → POST /v3/crud/user/search
- auth_ae_obj__user_id_change_password: PATCH /user/{id}/change_password → POST /v3/action/user/{id}/change_password
Credentials are now in the POST body (not query params) for authenticate calls.
Updated two call sites in e_app_sign_in_out.svelte to drop removed null_account_id param.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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