fix(minestom): configure shadowJar so the loader gets a real JarInJar

[TheMeinerLP]

Problem

The published net.luckperms:minestom-loader:5.6-SNAPSHOT jar carries un-relocated net/kyori/adventure/** and net/bytebuddy/** at the top level. That defeats the JarInJar isolation and pins every consumer (Titan, etc.) to LuckPerms' bundled (older) Adventure version, causing runtime failures like:

ServiceConfigurationError: net.kyori.adventure.text.logger.slf4j.ComponentLoggerProvider:
Provider net.minestom.server.adventure.provider.MinestomComponentLoggerProvider could not be instantiated
Caused by: java.lang.NoSuchMethodError:
'net.kyori.adventure.util.Buildable$Builder net.kyori.adventure.text.flattener.ComponentFlattener.toBuilder()'
  at net.minestom.server.adventure.provider.MinestomFlattenerProvider.<clinit>(MinestomFlattenerProvider.java:14)
  at net.minestom.server.adventure.provider.MinestomComponentLoggerProvider.<clinit>(...)

…on modern Minestom (2026.05.17-1.21.11).

Root cause

:minestom/build.gradle declares the shadow plugin but has no shadowJar configuration:

• the output is <name>-all.jar (plain .jar extension), and
• it performs no relocations.

:minestom/loader/build.gradle then embeds the file via

shadowJar {
    from { project(':minestom').tasks.shadowJar.archiveFile }
}

Because the input is a .jar, the Shadow plugin unzips it into the outer loader jar. Combined with the missing relocations, the loader jar ends up with net/kyori/adventure/** and net/bytebuddy/** at top level instead of carrying the inner shadow jar as a single resource.

Fix

Mirror the :velocity shadowJar configuration (the closest analogue, since Velocity is also an Adventure-native platform):

• archiveFileName = 'luckperms-minestom.jarinjar' — Shadow does not unzip non-.jar inputs, so the loader's from copies the file verbatim; the name also matches the JAR_NAME constant in MinestomLoader.java that the JarInJarClassLoader looks up at runtime.
• The exact same relocate set as :velocity (adventure, event, caffeine, okio, okhttp3, bytebuddy, commodore, mariadb, mysql, postgresql, hikari, mongodb, bson, jedis, nats, rabbitmq, commons-pool2, configurate, snakeyaml).
• artifacts { archives shadowJar } so the loader picks up the configured archive.

Effect

After this change, minestom-loader-5.6-SNAPSHOT.jar contains luckperms-minestom.jarinjar as a single resource (no top-level net/kyori/adventure/**) and the embedded LuckPerms platform runs inside its JarInJar-isolated classloader as designed — restoring the same isolation guarantees the Bukkit/Velocity loaders already provide.

Test plan

• CI builds :minestom:shadowJar and :minestom:loader:shadowJar successfully.
• Inspect minestom-loader-<ver>.jar: top-level entries are me/lucko/..., META-INF/, luckperms-minestom.jarinjar — and no net/kyori/adventure/** or net/bytebuddy/** at the top level.
• 5.6-SNAPSHOT deploys to the OLF snapshots repo.
• Downstream Titan smoke test: server boots, LuckPermsProvider.get() works, no Adventure NoSuchMethodError on Minestom 2026.05.17-1.21.11.

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