A TLD owner needed to run their namespace without the operator: set what
every name under the TLD sells for, take the TLD off the public registry
for a while, and still register names under it themselves.
Both settings live on chain in the TLD's TUPD records (`price`, `hidden`)
because changes are rare and every client already walks the TLD beacon.
The gateway's /api/tlds now carries records, owner, price_usd and
hidden_by per TLD; pricing.js quotes the owner price ahead of the length
tiers and only trusts a TLD_BEACON-sourced list; the register flow refuses
hidden and frozen TLDs for the public but lets the owner through at the
platform share only (the 90% owner cut would be paid to themselves). The
portal's TLDs tab loads real holdings, shows price and on/off state, and
gives each TLD a one-click switch, a price/policy editor and an inline
"register a name under .tld" form. Docs and the design table describe the
two new records.
