Scaffold Java 21 multi-module project with UMD ISO + SFO parsing

- Gradle Kotlin DSL multi-module (core, ui, cli) with JPMS modules
- UMD ISO 9660 reader (UmdIsoReader/UmdIsoFile + sector devices)
- SFO (param.sfo) parser
- 'dump' CLI command: metadata + recursive file listing
- JUnit 5 + AssertJ tests (SFO and ISO reader)
- Switch license from MIT to GPL-3.0-or-later

gradle/libs.versions.toml

@@ -0,0 +1,18 @@
+[versions]
+junit = "5.11.4"
+junit-platform = "1.11.4"
+assertj = "3.27.3"
+slf4j = "2.0.16"
+logback = "1.5.16"
+javafx = "21.0.5"
+ffmpeg = "7.1.1-1.5.11"
+
+[libraries]
+junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit" }
+junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junit-platform" }
+assertj-core = { module = "org.assertj:assertj-core", version.ref = "assertj" }
+slf4j-api = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
+logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
+javafx-controls = { module = "org.openjfx:javafx-controls", version.ref = "javafx" }
+ffmpeg-platform = { module = "org.bytedeco:ffmpeg-platform", version.ref = "ffmpeg" }