实现账号绑定、持久登录与跨设备对局恢复

shared/accountIdentity.js

@@ -0,0 +1,5 @@
+// A role's UID is unique within its provider-reported server region. Display names are never identity keys.
+// gameId is optional provider metadata (the official password API may omit it), so it cannot be part of identity.
+export const roleKey = (role) => JSON.stringify([String(role.channelName || '').trim(), String(role.uid).trim()]);
+export const hasRoleIdentity = (role) => role?.uid != null && String(role.uid).trim() !== ''
+  && String(role.channelName || '').trim() !== '';