Three browser-facing endpoints now require a kind-27235 HTTP auth event
(NIP-98) proving the caller controls the pubkey:
- GET /subscription/email — pubkey extracted from auth header instead
of query param; returns subscription for the authed pubkey.
- PUT /subscription/email — pubkey extracted from auth header instead
of trusting a client-supplied body field.
- DELETE /subscription/:key — verifies auth pubkey matches subscription
owner (returns 403 if mismatch).
Server-side: decode base64 'Nostr <b64>' Authorization header, JSON.parse,
check kind === 27235, verifyEvent (nostr-tools/pure), then check u /
method / payload tags against the request URL / method / body.
README updated to reflect 'implemented' auth (not 'planned').
Integration test updated to generate NIP-98 auth headers via a new helper
script (script/nip98-auth-header.mjs).
