feat(news-research): RSS feed discovery, filter, and AI-context export

New sibling module to news/. Discovers topic-matched RSS feeds via
SearXNG (mana-search) or rel="alternate" probing of a site URL,
filters articles by keyword with a recency + title-match boost,
and exports the top hits as a markdown context block for the AI.

- API: /api/v1/news-research/{discover,validate,search,extract}
- Frontend: /news-research route + workbench ListView (compact card)
- Tool: research_news LLM tool (read-only, runs auto)
- Pin feeds → newsPreferences.customFeeds (encrypted) — covers the
  long-missing custom-RSS subscription gap; reading-list saves still
  go through articlesStore.saveFromUrl into the existing newsArticles
- shared-branding: new news-research entry + binoculars icon

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/api/src/index.ts

@@ -29,6 +29,7 @@ import { foodRoutes } from './modules/food/routes';
 import { guidesRoutes } from './modules/guides/routes';
 import { moodlitRoutes } from './modules/moodlit/routes';
 import { newsRoutes } from './modules/news/routes';
+import { newsResearchRoutes } from './modules/news-research/routes';
 import { tracesRoutes } from './modules/traces/routes';
 import { presiRoutes } from './modules/presi/routes';
 import { researchRoutes } from './modules/research/routes';
@@ -61,6 +62,7 @@ app.route('/api/v1/food', foodRoutes);
 app.route('/api/v1/guides', guidesRoutes);
 app.route('/api/v1/moodlit', moodlitRoutes);
 app.route('/api/v1/news', newsRoutes);
+app.route('/api/v1/news-research', newsResearchRoutes);
 app.route('/api/v1/traces', tracesRoutes);
 app.route('/api/v1/presi', presiRoutes);
 app.route('/api/v1/research', researchRoutes);