feat(automod): render sticker, role & user names in moderation views

QoL lanjutan dari fix60084b3: content pesan mentah masih nampilin
snowflake (<@&roleid>, <@userid>, <:emoji:id>) di log moderasi dan
prompt LLM. Sekarang dirender ke nama yang bisa dibaca:

- Gateway capture: metadata menyimpan mentionedRoles + mentionedUsers
  (id+name) dari message.mentions, disimpan ke metadata JSON
- renderDiscordMentions(): <@&id> -> @RoleName, <@id> -> @Username,
  <:name:id> -> :name:, fallback @role/@user — dipakai di
  conversationContext (konteks LLM) dan moderationBuilders
  (getAnalysisContent) sehingga LLM lihat nama role/user beneran,
  bukan placeholder generik
- Frontend renderMessageContent() (mirror gateway) dipasang di semua
  tempat nampilin content: message-card, message-detail(-view),
  search-overlay, search-panel, users/channels section, live-stream,
  mod-queue, review list; sticker-only message tetap [Sticker: name],
  pesan teks+sticker kini ikut nampilin nama sticker
- tsc --noEmit PASS di gateway & frontend; renderDiscordMentions
  diverifikasi manual (6 kasus: role/user/emoji/unknown/plain)

services/discord-gateway/src/modules/ai-moderation/moderationBuilders.ts

@@ -7,6 +7,7 @@
 
 import { messageStore } from "../message-capture/messageStore.js";
 import type { MessageRecord } from "../message-capture/types.js";
+import { renderDiscordMentions } from "../message-capture/messageMetadata.js";
 import { sanitizeDiscordTokens } from "./discordTokens.js";
 
 /** Simple XML-escaping for content text. */
@@ -30,7 +31,9 @@ export function getAnalysisContent(message: MessageRecord): string {
     /\[(?:Attachment|Sticker):[^\]]*\]|\[Embed\]/g,
     "",
   );
-  return sanitizeDiscordTokens(stripped).trim();
+  return sanitizeDiscordTokens(
+    renderDiscordMentions(stripped, message.metadata),
+  ).trim();
 }
 
 /**