Add admin settings for nostr keys

app/views/admin/settings/services/_nostr.html.erb

@@ -7,4 +7,17 @@
     title: "Enable Nostr integration (experimental)",
     description: "Allow adding nostr pubkeys and resolve user addresses via NIP-05"
   ) %>
+<% if Setting.nostr_enabled? %>
+  <%= render FormElements::FieldsetResettableSettingComponent.new(
+        key: :nostr_private_key,
+        type: :password,
+        title: "Private key",
+        description: "The private key of the accounts service, used when publishing events (e.g. zap receipts)"
+      ) %>
+  <%= render FormElements::FieldsetResettableSettingComponent.new(
+        key: :nostr_public_key,
+        title: "Public key",
+        description: "The corresponding public key of the accounts service"
+      ) %>
+<% end %>
 </ul>