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

backend/main.py

@@ -95,8 +95,8 @@ async def live_data_slow(request: Request):
         "satellites": d.get("satellites", []),
         "kiwisdr": d.get("kiwisdr", []),
         "space_weather": d.get("space_weather"),
-        "radiation": d.get("radiation", []),
-        "internet_outages": d.get("internet_outages", [])
+        "internet_outages": d.get("internet_outages", []),
+        "firms_fires": d.get("firms_fires", [])
     }
     # ETag based on last_updated + item counts
     last_updated = d.get("last_updated", "")