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>

apps/aelis-backend/src/server.ts

@@ -5,7 +5,7 @@ import { registerAuthHandlers } from "./auth/http.ts"
 import { mockAuthSessionMiddleware, requireSession } from "./auth/session-middleware.ts"
 import { createFeedEnhancer } from "./enhancement/enhance-feed.ts"
 import { createLlmClient } from "./enhancement/llm-client.ts"
-import { registerFeedHttpHandlers } from "./engine/http.ts"
+import { registerFeedHttpHandlers } from "./feed/http.ts"
 import { registerLocationHttpHandlers } from "./location/http.ts"
 import { UserSessionManager } from "./session/index.ts"
 import { WeatherSourceProvider } from "./weather/provider.ts"