Replace BukkitObjectOutputStream with Bukkit's native ItemStack.serialize() API using YAML format with Base64 encoding for version-stable storage. ## Changes **ItemSerializer.java** - Modern YAML-based serialization using Bukkit API - Automatic format detection (YAML:/LEGACY:/old) - Graceful fallback to legacy format on errors **DataConverter.java** - Automatic migration from DataVersion 3 to 4 - Smart format detection with three upgrade paths - Chest data migration with multi-line Base64 handling - Automatic backup creation before migration **SignShopItemMeta.java** - Add try-catch for Spigot 1.21.10 getName() NoSuchElementException - Handle custom texture heads without player data ## Fixes - wargamer#170: Shop creation failures - wargamer#168: Potions showing out of stock incorrectly - wargamer#161: Fireworks comparison issues - wargamer#165: Null errors in shop loading - wargamer#83: Book content corruption - Spigot 1.21.10 compatibility ## Benefits - Human-readable format (decode Base64 to inspect YAML) - Version-stable across Minecraft updates - Maintains backward compatibility - No external dependencies ## Known Issues - HeadDatabase heads from pre-v4.20.3 may need replacement - Recommend HeadDatabase 4.21.5+ for player head compatibility Version: 5.1.0

Fireworks show out of stock but aren't, reported on Discord #161

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