Bootstrap Castarr from NodeCast prototype

Imported the native TV app (Kotlin, ExoPlayer, embedded remote server, QR
pairing) plus CONTEXT.md and ADRs 0001-0005. Rename, Compose for TV UI and
the Dispatcharr integration follow as tracked issues.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists