Export the news proxy so a host's local server can mount it

`./server/providers/news` (node) with its own package boundary, so a host composing its own local providers can serve /api/news from GEV_NEWS_ORIGIN as Core's standalone server does.

package.json

@@ -134,6 +134,9 @@
     "./server/providers/regional": {
       "node": "./server/providers/regional.js"
     },
+    "./server/providers/news": {
+      "node": "./server/providers/news.js"
+    },
     "./server/providers/openai": {
       "node": "./server/providers/openai.js"
     },