feat(core): add RenderedFeedItem type with JRX UI support

Add RenderedFeedItem that extends FeedItem with a ui: JrxNode field
for client-side rendering. Add @nym.sh/jrx and @json-render/core as
peer dependencies on @aelis/core.

Co-authored-by: Ona <no-reply@ona.com>

packages/aelis-core/package.json

@@ -7,6 +7,10 @@
 	"scripts": {
 		"test": "bun test ."
 	},
+	"peerDependencies": {
+		"@nym.sh/jrx": "*",
+		"@json-render/core": "*"
+	},
 	"dependencies": {
 		"@standard-schema/spec": "^1.1.0"
 	}