refactor: extract Discord.js code from shared services into bot layer

Move terminal.service.ts and prune.service.ts entirely to bot/modules/
since they are Discord-specific. Split lootdrop.service.ts: pure logic
(activity tracking, DB ops, claim) stays in shared/, Discord operations
(message sending, channel interactions) move to bot/modules/economy/
lootdrop.handler.ts. Move effect registry/handlers/types from bot/ to
shared/modules/inventory/ since they contain no Discord.js imports and
are needed by inventory.service.ts in shared.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bot/modules/economy/lootdrop.handler.ts

@@ -0,0 +1,60 @@
+import { Message, TextChannel } from "discord.js";
+import { lootdropService } from "@shared/modules/economy/lootdrop.service";
+import { getLootdropMessage } from "./lootdrop.view";
+import { terminalService } from "@modules/system/terminal.service";
+
+/**
+ * Process a Discord message for lootdrop activity tracking.
+ * Called from messageCreate event handler.
+ */
+export async function processLootdropMessage(message: Message): Promise<void> {
+    if (message.author.bot || !message.guild) return;
+
+    const { shouldSpawn } = lootdropService.trackActivity(message.channel.id);
+
+    if (shouldSpawn) {
+        await spawnLootdrop(message.channel as TextChannel);
+    }
+}
+
+/**
+ * Spawn a lootdrop in a Discord channel.
+ * Used by both bot events and API routes.
+ */
+export async function spawnLootdrop(
+    channel: TextChannel,
+    overrideReward?: number,
+    overrideCurrency?: string
+): Promise<void> {
+    const { reward, currency } = lootdropService.calculateReward(overrideReward, overrideCurrency);
+    const { content, files, components } = await getLootdropMessage(reward, currency);
+
+    try {
+        const sentMessage = await channel.send({ content, files, components });
+        await lootdropService.persistLootdrop(sentMessage.id, channel.id, reward, currency);
+        terminalService.update(channel.guildId);
+    } catch (error) {
+        console.error("Failed to spawn lootdrop:", error);
+    }
+}
+
+/**
+ * Delete a lootdrop from DB and Discord.
+ */
+export async function deleteLootdrop(messageId: string): Promise<boolean> {
+    const result = await lootdropService.removeLootdrop(messageId);
+    if (!result) return false;
+
+    try {
+        const { AuroraClient } = await import("@/lib/BotClient");
+        const channel = await AuroraClient.channels.fetch(result.channelId) as TextChannel;
+        if (channel) {
+            const message = await channel.messages.fetch(messageId);
+            if (message) await message.delete();
+        }
+    } catch (e) {
+        console.warn("Could not delete lootdrop message from Discord:", e);
+    }
+
+    return true;
+}