Added

Core Inventory System

• InventoryStorageManager for orchestrating save/load/delete operations
• InventoryStorageStrategy interface for pluggable storage backends
• JsonInventoryStorage implementation for JSON file-based persistence
• InventoryIdentifier for managing UUID, suffix, and custom name identifiers
• InventoryUtils and ItemContainerUtils for inventory manipulation

Save/Load Functionality

• Save inventories by UUID (player-specific)
• Save inventories with suffix (UUID + named variant)
• Save inventories by custom name (shared/global presets)
• Restore inventories with optional file deletion
• Full support for hotbar, storage, backpack, armor, and utility slots

Inventory Listing

• listNamedInventories() - List custom-named inventories
• listSuffixInventories(UUID) - List player-specific suffix inventories
• listUUIDOnlyInventories() - List UUID-only inventories
• /invm list command with filtering options

Configuration System

• StorageDirectory - Configurable inventory storage location
• ClearInventoryOnSave - Option to clear inventory after saving
• DeleteFileOnLoad - Option to delete file after restoring
• Auto-generated default configuration on first run

Commands

• /invm save - Save current player inventory
• /invm load - Restore a saved inventory
• /invm list - List available saved inventories
• /invm config view - Display current configuration
• /invm config set - Modify configuration values
• /invm config save - Persist configuration to disk
• /invm config reload - Reload configuration from disk

API Access

• InventoryManagerAPIPlugin.get() singleton access
• getInventoryStorageManager() for API consumers
• Async operations via CompletableFuture