Bootstrap KwabaTV Gradle project, minimal WebView shell

Gradle wrapper pinned to 8.7, AGP 8.5.2, compileSdk 34/minSdk 21/
targetSdk 34 - the tested combination from the original app.
MainActivity is a placeholder that just loads BuildConfig.WEBSITE_URL
(the new /tv room-list route); the real key-mapping logic is a
separate follow-up commit.

Note for future builds on this machine: Android Studio's bundled JBR
is JDK 25, which Gradle 8.7 cannot run on at all (crashes at startup
with a bare version-string error). Built and verified with a
separately-installed Temurin JDK 21 instead
(C:\Users\GGB\jdks\jdk-21.0.12.1+1) - set JAVA_HOME to that for any
Gradle command in this repo, not the Android Studio JBR.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LHgWjmEJXsJEi1EVAoTp4K

app/src/main/java/de/ggb/kwabatv/MainActivity.kt

@@ -0,0 +1,16 @@
+package de.ggb.kwabatv
+
+import android.app.Activity
+import android.os.Bundle
+import android.webkit.WebView
+
+class MainActivity : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val webView = WebView(this)
+        setContentView(webView)
+        webView.settings.javaScriptEnabled = true
+        webView.settings.domStorageEnabled = true
+        webView.loadUrl(BuildConfig.WEBSITE_URL)
+    }
+}