chore: support nip-11a

Author: cameri

package.json

@@ -16,8 +16,10 @@
     26,
     28,
     33,
-    40,
-    111
+    40
+  ],
+  "supportedNipExtensions": [
+    "11a"
   ],
   "main": "src/index.ts",
   "scripts": {

src/handlers/request-handlers/root-request-handler.ts

@@ -23,20 +23,21 @@ export const rootRequestHandler = (request: Request, response: Response, next: N
       pubkey,
       contact,
       supported_nips: packageJson.supportedNips,
+      supported_nip_extensions: packageJson.supportedNipExtensions,
       software: packageJson.repository.url,
       version: packageJson.version,
       limitation: {
             max_message_length: settings.network.maxPayloadSize,
-            max_subscriptions: settings.limits.client.subscription.maxSubscriptions,
-            max_filters: settings.limits.client.subscription.maxFilters,
+            max_subscriptions: settings.limits?.client?.subscription?.maxSubscriptions,
+            max_filters: settings.limits?.client?.subscription?.maxFilters,
             max_limit: 5000,
             max_subid_length: 256,
             min_prefix: 4,
             max_event_tags: 2500,
             max_content_length: 102400,
-            min_pow_difficulty: settings.limits.event.eventId.minLeadingZeroBits,
+            min_pow_difficulty: settings.limits?.event?.eventId?.minLeadingZeroBits,
             auth_required: false,
-            payment_required: settings.payments.enabled,
+            payment_required: settings.payments?.enabled,
       },
       payments_url: paymentsUrl.toString(),
       fees: Object