[ClausValcaTD]

Implement a background WebSocket server service on Android TV compatible with minSdk 19 (KitKat).

Key changes:

1. Added org.java-websocket:Java-WebSocket:1.5.4 dependency.
2. Implemented LibreCastServer.java listening on port 8080 (0.0.0.0) with single active client connection management and raw binary ByteBuffer chunk receiving for high throughput and low GC overhead.
3. Implemented ReceiverService.java managing LibreCastServer lifecycle, acquiring WifiLock (WIFI_MODE_FULL_HIGH_PERF) and WakeLock (PARTIAL_WAKE_LOCK), and broadcasting status updates.
4. Implemented NetworkUtils.java to resolve local Wi-Fi and Ethernet IPv4 addresses.
5. Updated MainActivity.java, activity_main.xml, and strings.xml to start service and display real-time server address (ws://:8080) and connection state.
6. Added unit tests in LibreCastServerTest and NetworkUtilsTest.

---

PR created automatically by Jules for task 7474672050440416523 started by @ClausValcaTD

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.