Fix reward kit redemption for items with multiple enchants

[iphonetips1]

Motivation

• Reward kits failed to redeem when an item contained multiple enchants due to the AxAPI enchant conversion path throwing Cannot convert direct holder to bukkit representation on newer Paper/Purpur (1.21) builds.
• The change aims to avoid the broken conversion path by normalizing and extracting enchant data before item construction and applying Bukkit enchantments directly.

Description

• Extract enchant entries from the normalized claim-items map for both enchants and enchantments keys and remove them from the map prior to calling ItemBuilder.create(...).
• Add robust parsing that accepts map, list, and key:level string forms and resolves both namespaced IDs and legacy enchant names via NamespacedKey and Enchantment.getByName(...).
• Apply parsed Enchantment -> level pairs directly to the resulting ItemStack using addUnsafeEnchantment(...) to avoid the AxAPI conversion path that crashes on 1.21.
• Implement helper methods extractEnchantments, addEnchantmentsFromValue, addParsedEnchantment, resolveEnchantment, and applyEnchantments in RewardGui to encapsulate the logic.

Testing

• Ran mvn -q -DskipTests compile, which failed in this environment due to Maven Central returning HTTP 403 so full compile validation could not complete.
• Ran git status --short which succeeded and committed the change with git commit.
• No automated runtime tests were available in this environment to reproduce the original crash, but the change targets the known conversion path causing the IllegalArgumentException.

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Codex Task