Major Changes:
- Full support for multiple container types:
- ✅ Chest
- ✅ Barrel
- ✅ All Shulker Box variants
- You can now set the container type via GUI
- LootChests placed with the correct container type now:
- ✨ Show correct holograms
- Are protected from explosions
- Automatically refill via scheduled tasks

Technical improvements:
- Removed all hard dependencies on `Material.CHEST`
- Unified logic using Bukkit's `Container` interface
- Improved reliability and type safety
- New container types handled via `SupportedContainers.java`

Configuration:
- Each chest entry in `chests.yml` now contains `blockType`
- Existing chests default to `CHEST`, backward-compatible

Important:
- Be sure to reload your config or restart your server after update.

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