feat(fancyworlds): add Folia support

[yunuservices]

This PR adds Folia support to FancyWorlds by moving world lifecycle operations behind Paper/Folia-specific implementations.

What changed

• add runtime Folia detection
• add a platform abstraction for world create/unload logic
• implement Paper and Folia world lifecycle handlers
• update world create, world load, and world unload to use the new platform layer
• switch forced player moves to teleportAsync
• add Folia-safe global scheduling helpers
• mark the plugin as Folia-supported
• use the Folia dev bundle for compilation

Verification

Built successfully with:

• ./gradlew :plugins:fancyworlds:compileJava
• ./gradlew :plugins:fancyworlds:shadowJar

Note

A live Folia smoke test is still recommended before merging.