refactor: centralize custom interaction IDs into constants

Replace all hardcoded custom ID strings with module-level constants.
Each module now has *_CUSTOM_IDS in its types file, using functions
for dynamic IDs and PREFIX for startsWith matching.

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

bot/modules/moderation/prune.types.ts

@@ -1,3 +1,8 @@
+export const PRUNE_CUSTOM_IDS = {
+    CONFIRM: "confirm_prune",
+    CANCEL: "cancel_prune",
+} as const;
+
 export interface PruneOptions {
     amount?: number;
     userId?: string;

bot/modules/moderation/prune.view.ts

@@ -1,5 +1,5 @@
 import { EmbedBuilder, ActionRowBuilder, ButtonBuilder, ButtonStyle, Colors } from "discord.js";
-import type { PruneResult, PruneProgress } from "./prune.types";
+import { PRUNE_CUSTOM_IDS, type PruneResult, type PruneProgress } from "./prune.types";
 
 /**
  * Creates a confirmation message for prune operations
@@ -25,12 +25,12 @@ export function getConfirmationMessage(
         .setTimestamp();
 
     const confirmButton = new ButtonBuilder()
-        .setCustomId("confirm_prune")
+        .setCustomId(PRUNE_CUSTOM_IDS.CONFIRM)
         .setLabel("Confirm")
         .setStyle(ButtonStyle.Danger);
 
     const cancelButton = new ButtonBuilder()
-        .setCustomId("cancel_prune")
+        .setCustomId(PRUNE_CUSTOM_IDS.CANCEL)
         .setLabel("Cancel")
         .setStyle(ButtonStyle.Secondary);