v0.5.0: FIRMS fire hotspots, space weather, internet outages

New intelligence layers:
- NASA FIRMS VIIRS fire hotspots (5K+ global thermal anomalies, flame icons)
- NOAA space weather badge (Kp index in status bar)
- IODA regional internet outage monitoring (grey markers, BGP/ping only)

Key improvements:
- Fire clusters use flame-shaped icons (not circles) for clear differentiation
- Internet outages are region-level with reliable datasources only
- Removed radiation layer (no viable free real-time API)
- All outage markers grey to avoid color confusion with other layers
- Filtered out merit-nt telescope data that produced misleading percentages

Updated changelog modal, README, and package.json for v0.5.0.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Former-commit-id: 195c6b64b9

frontend/src/components/WorldviewLeftPanel.tsx

@@ -58,8 +58,7 @@ const WorldviewLeftPanel = React.memo(function WorldviewLeftPanel({ data, active
         { id: "gibs_imagery", name: "MODIS Terra (Daily)", source: "NASA GIBS", count: null, icon: Globe },
         { id: "highres_satellite", name: "High-Res Satellite", source: "Esri World Imagery", count: null, icon: Satellite },
         { id: "kiwisdr", name: "KiwiSDR Receivers", source: "KiwiSDR.com", count: data?.kiwisdr?.length || 0, icon: Radio },
-        { id: "firms", name: "Thermal Anomalies", source: "NASA FIRMS VIIRS", count: null, icon: Flame },
-        { id: "radiation", name: "Radiation Monitors", source: "Safecast CC0", count: data?.radiation?.length || 0, icon: Activity },
+        { id: "firms", name: "Fire Hotspots (24h)", source: "NASA FIRMS VIIRS", count: data?.firms_fires?.length || 0, icon: Flame },
         { id: "internet_outages", name: "Internet Outages", source: "IODA / Georgia Tech", count: data?.internet_outages?.length || 0, icon: Wifi },
         { id: "day_night", name: "Day / Night Cycle", source: "Solar Calc", count: null, icon: Sun },
     ];