feat: Introduced an admin listing command and shop interaction module, replacing the sell command, and added a type-checking script.

src/modules/economy/shop.interaction.ts

@@ -0,0 +1,40 @@
+import { ButtonInteraction, MessageFlags } from "discord.js";
+import { inventoryService } from "@/modules/inventory/inventory.service";
+import { userService } from "@/modules/user/user.service";
+import { createErrorEmbed, createWarningEmbed } from "@/lib/embeds";
+
+export async function handleShopInteraction(interaction: ButtonInteraction) {
+    if (!interaction.customId.startsWith("shop_buy_")) return;
+
+    try {
+        await interaction.deferReply({ flags: MessageFlags.Ephemeral });
+
+        const itemId = parseInt(interaction.customId.replace("shop_buy_", ""));
+        if (isNaN(itemId)) {
+            await interaction.editReply({ embeds: [createErrorEmbed("Invalid Item ID.")] });
+            return;
+        }
+
+        const item = await inventoryService.getItem(itemId);
+        if (!item || !item.price) {
+            await interaction.editReply({ embeds: [createErrorEmbed("Item not found or not for sale.")] });
+            return;
+        }
+
+        const user = await userService.getOrCreateUser(interaction.user.id, interaction.user.username);
+
+        // Double check balance here too, although service handles it, we want a nice message
+        if ((user.balance ?? 0n) < item.price) {
+            await interaction.editReply({ embeds: [createWarningEmbed(`You need ${item.price} 🪙 to buy this item. You have ${user.balance} 🪙.`)] });
+            return;
+        }
+
+        const result = await inventoryService.buyItem(user.id, item.id, 1n);
+
+        await interaction.editReply({ content: `✅ **Success!** You bought **${item.name}** for ${item.price} 🪙.` });
+
+    } catch (error: any) {
+        console.error("Shop Purchase Error:", error);
+        await interaction.editReply({ embeds: [createErrorEmbed(error.message || "An error occurred while processing your purchase.")] });
+    }
+}