Implement NIP-98 authentication for HTTP requests, enhancing security for event export and import functionalities. Update server methods to validate authentication and permissions, and refactor event handling in the Svelte app to support new export and import features. Add UI components for exporting and importing events with appropriate permission checks.

pkg/protocol/httpauth/doc.go

@@ -0,0 +1,5 @@
+// Package httpauth provides helpers and encoders for nostr NIP-98 HTTP
+// authentication header messages and a new JWT authentication message and
+// delegation event kind 13004 that enables time limited expiring delegations of
+// authentication (as with NIP-42 auth) for the HTTP API.
+package httpauth