Rename app to Castarr (dev.castarr.tv), add JDK toolchain resolution

Package/applicationId com.nodecast.tv -> dev.castarr.tv, all branding in app
and remote page renamed, remote localStorage key changed. Foojay toolchain
resolver + jvmToolchain(17) so hosts with only a JRE can build.

Closes #1

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

settings.gradle.kts

@@ -6,6 +6,10 @@ pluginManagement {
     }
 }
 
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {
@@ -14,5 +18,5 @@ dependencyResolutionManagement {
     }
 }
 
-rootProject.name = "NodeCast"
+rootProject.name = "Castarr"
 include(":app")