security: drop the admin endpoint surface and land pending hardening

Removes the admin-gated endpoints and the account flags they set, plus a
batch of hardening that had accumulated uncommitted in the tree. These were
deployed and verified together, so they land as one change.

admin surface:
  - drop POST /hidepay, POST /unlimit and GET /users, their handlers, and
    the now-unused admin preValidation export
  - `unlimited` was only ever written, never read; `hidepay` only appeared
    in output projections. Both flags go, along with their whitelist,
    public-fields and type entries.

request log:
  - redactBody now recurses. It only masked top-level keys, so a body that
    nests credentials one level down wrote them to the log in plaintext,
    and pin fields were not on the list at all.

payments:
  - sendOnchain/build gate `aid` through requireAccount, so a caller can
    only spend from an account it owns
  - sendOnchain signs only a tx we composed, matched against a short-lived
    per-account build receipt
  - raise xpay retry_for to 60s; route-finding preferred a drained zero-fee
    hop and burned the whole budget on it. check()'s reversal window keeps
    its 2x margin.

ecash / invoices / webhooks:
  - resolve a token's mint through the IP-pinning fetcher instead of plain
    fetch, closing an unauthenticated SSRF path into the internal network
  - reject non-positive amounts before the balance write
  - /sign requires the caller to own the address, rather than signing under
    any address the hot wallet controls
  - webhook delivery no longer disables TLS verification; the body carries
    the merchant's shared secret

registration:
  - refuse a username the v3 registrar holds unless the caller's own nostr
    key is the holder (lib/names.ts)

liquid:
  - honour the deposit kill switch at invoice generation and at credit

elements image:
  - pin 23.3.4 and verify the release tarball checksum

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_0112TGi9GGNWqji1XQ5jZRzc

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