Add Paper 26.2 compatibility foundation

[cgmoreda]

Summary

Adds foundational Paper/Minecraft 26.2 compatibility for CoreProtect.

This includes:

• Updating the Paper API dependency to 26.2.build.23-alpha
• Allowing startup on Minecraft/Paper 26.2
• Adding explicit 2602 adapter routing for Bukkit, Paper, and Spigot
• Adding 26.2 block/material handling for Sulfur and Cinnabar-related blocks
• Adding Sulfur Cube spawn egg and bucket placement support
• Logging Sulfur Cube bucket capture transactions
• Preserving Sulfur Cube bucket absorbed-content item data where Paper exposes it
• Logging Sulfur Cube shearing and dispenser interaction drops where exposed by events
• Restoring supported Sulfur Cube entity metadata: size, ageable state, fuse ticks, and from-bucket state
• Adding a Paper 26.2 manual compatibility test matrix

Notes

No database schema changes are included.

TNT-absorbed Sulfur Cube explosions currently use existing explosion logging and are attributed as #explosion; custom #sulfur_cube explosion attribution is intentionally not added.

Live Sulfur Cube absorbed entity content is not restored because Paper currently exposes entity data components read-only in this path.

Validation

Built successfully with:

mvn -B -DskipTests -Dproject.branch=development clean package