ReSilence Custom items

• Added a two-player trade system with the /trade <namaPemain> command. Sending the command to another player creates an invite; they accept by running the same command back within 30 seconds.
• Trade UI: 6-row inventory with glass borders/dividers, player name accents on the top row, dedicated offer slots on the left (inviter) and right (invitee), green/red ready buttons, and a barrier button centered in the middle to cancel.
• Interaction rules: players can only move items in their own offer slots; decoration, partner slots, and divider glass are locked. Shift-click from the player inventory is blocked, double-clicks and drop-key actions in the UI are disabled, and any item movement resets both ready states.
• Completion and safety: when both players click ready, items swap sides; any overflow is dropped at the player’s feet. Cancelling or closing returns items to their owners. Successful trades send the chat message “Trade Sudah selesai” to both players.
• Metadata updated to ReSilenceCustomItems with main class com.resilencecustomitems.ReSilenceCustomItemsPlugin and the trade command registered in plugin.yml.

Server Validation

✅ Server validation passed - The mod was tested on a real Minecraft server and loaded successfully.