feat(loot): generated chest first-open loot injection

[JARVIS-AT-ROOTCAUSED]

Summary

• implement LootManager as an event listener for chest first-open injection
• implement LootChest helper backed by PersistentDataContainer marker to ensure one-time injection
• inject random Tome/Artefact rewards into generated chest inventories based on configurable chances
• wire loot module enable + listener registration in SupremeCore
• add Loot/config.yml with chance and gating controls

Behavior

• interception occurs on InventoryOpenEvent for chest inventories
• only processes lootable chests and (by default) requires a loot table to target generated world chests
• each eligible chest is marked as injected to avoid repeat rolls

Config

Loot/config.yml

• injection.tome-chance
• injection.artefact-chance
• injection.max-rolls
• injection.require-loot-table