* fix(frontend): stop re-validating account emails the backend accepted
userSchema checked email with zod's email(), which rejects many addresses
pydantic EmailStr registers (a&b@example.com, a@b.c, Unicode). /auth/me for
such an account parsed as malformed: SSR answered gateway_unavailable, the
offline banner never recovered, and the admin user list failed for every
administrator. The backend owns address validation; keep a non-empty string.
* docs(changelog): reference #7449 for the account email schema fix
1792e4e432