feat: add .creds files for erpnext, teable, tubearchivist, storyteller

Write credentials to ~/appname.creds matching existing convention
(affine, discourse, ente). Update CT scripts to reference .creds.

- erpnext: admin pass, db root pass
- teable: db pass, secret key
- tubearchivist: admin pass, ES pass
- storyteller: secret key

ct/erpnext.sh

@@ -46,4 +46,4 @@ echo -e "${INFO}${YW} Access it using the following URL:${CL}"
 echo -e "${TAB}${GATEWAY}${BGN}http://${IP}${CL}"
 echo -e "${INFO}${YW} Credentials:${CL}"
 echo -e "${TAB}${BGN}Username: Administrator${CL}"
-echo -e "${TAB}${BGN}Password: see /opt/frappe-bench/.env${CL}"
+echo -e "${TAB}${BGN}Password: see ~/erpnext.creds${CL}"

ct/tubearchivist.sh

@@ -75,3 +75,6 @@ msg_ok "Completed Successfully!\n"
 echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
 echo -e "${INFO}${YW} Access it using the following URL:${CL}"
 echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:8000${CL}"
+echo -e "${INFO}${YW} Credentials:${CL}"
+echo -e "${TAB}${BGN}Username: admin${CL}"
+echo -e "${TAB}${BGN}Password: see ~/tubearchivist.creds${CL}"