Create a production-ready Minecraft shop system that connects a Discord bot, KHQR payment system, database, and Minecraft server (Paper/Bukkit 1.21.11). The Discord bot (Node.js discord.js v14) should provide commands like /shop, /buy kit , /buy rank , and /myorders. The shop includes kits (Gold $0.50, Platinum $1, Diamond $1.50, Master $2.50, Grandmaster $5) and ranks (Gold $3, Platinum $6, Master $10, Grandmaster $15). When a user buys an item, the bot generates a KHQR payment QR code with a unique transaction ID and stores it in a database (SQLite or MySQL) as pending. After payment, the system confirms it via webhook (or admin /confirm fallback), updates status to paid, and automatically sends a safe command to the Minecraft server using RCON or a secure plugin. The server must only accept whitelisted commands like kit give or LuckPerms rank assignment, never full OP or console access. The system must prevent duplicate.