Fish Rework - Fishing

✨ New Features

• Custom Player Shops — Players can now create and manage their own fish stalls as custom shops. A full GUI system was added (CustomShopGUI, CustomShopAddItemGUI, CustomShopDeleteConfirmGUI) allowing players to list items for sale, configure prices, and delete listings.
• Vault Economy Integration — A full economy abstraction layer was introduced (EconomyProvider, EconomyManager, VaultEconomyProvider, VaultUnlockedEconomyProvider, InternalEconomyProvider), enabling seamless support for Vault-compatible economy plugins alongside the built-in internal economy.
• Sell All Confirmation GUI — A new SellAllConfirmGUI was added, giving players a confirmation screen before bulk-selling inventory contents.
• New Fish Shop Subcommand — The /fishing command now includes new subcommands for managing custom shops directly.

🔧 Changes & Improvements

• Fish Stall Manager Rework — FishStallManager was significantly overhauled with improved logic for stall placement, item registration, and economy transaction handling.
• Treasure Manager Rework — TreasureManager was heavily refactored with rewritten drop/trigger logic for more consistent and reliable treasure behaviour.
• Sell Shop GUI Improvements — SellShopGUI received a major update with cleaner layout and better sell confirmation flow integrated with the new economy system.
• MobManager Refactor — MobManager was cleaned up and improved for better mob handling stability.
• Collection GUI Update — Minor updates to collection display logic.
• Wiki Fixes — Documentation wiki files corrected.
• New Sea Creature Models — New model assets added for sea creatures.

🐛 Bug Fixes

• Fixed various issues following the 1.3.0 release (general fixes pass).
• Removed catfish — the catfish creature was removed from the spawn pool.
• Fixed BlockPlaceListener edge cases when placing fish stalls.
• Fixed TreasureListener transaction handling with the new economy layer.
• Fixed FishingListener and LavaFishingListener compatibility with economy provider abstraction.