feat: refine earth hud panel behaviors and news board

backend/app/api/v1/news.py

@@ -0,0 +1,13 @@
+from fastapi import APIRouter, Query
+
+from app.services.earth_news import get_earth_news_payload
+
+router = APIRouter()
+
+
+@router.get("/earth-feed")
+async def get_earth_feed(
+    lat: float | None = Query(None, description="Current Earth view center latitude"),
+    lon: float | None = Query(None, description="Current Earth view center longitude"),
+):
+    return await get_earth_news_payload(lat=lat, lon=lon)