Rename to ADS-Bit and show receiver IP

- Rename app from "SKY WATCH" to "ADS-Bit" (8-bit wordplay)
- Update page title to "ADS-Bit - Retro Flight Tracker"
- Add receiver IPs to /api/config endpoint
- Display connected receiver IP(s) in status bar
- Update screenshot

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server.py

@@ -308,7 +308,8 @@ async def handle_config(request):
     """Return client-relevant configuration"""
     return web.json_response({
         "theme": config.get("theme", "desert"),
-        "location": config["location"]
+        "location": config["location"],
+        "receivers": receivers
     })
 
 async def handle_http(request):