feat: announce on Discourse support forum (#17)

## Summary

- Adds `announceOnDiscourse` module to post announcements to the NHCarrigan Discourse support forum (category 16), tagged by announcement type
- Adds `chunkContent` utility to split long announcements at paragraph/line boundaries for Discord (2000 chars), Reddit (40,000 chars), and Discourse (32,000 chars); Reddit overflows chain as nested replies, Discord as sequential messages, Discourse as sequential replies
- Refactors the announcement route to run all platforms concurrently via `Promise.allSettled`, ensuring a failure on any one platform never blocks the others, with all results reported back
- Fixes generation failure response from incorrect `201` to `500`

✨ This PR was created with love from Hikari~ 🌸

Reviewed-on: #17
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

bot/src/index.ts

@@ -7,15 +7,12 @@
 import { DiscordAnalytics } from "@nhcarrigan/discord-analytics";
 import { Client, Events, GatewayIntentBits, Partials } from "discord.js";
 import { chatInputInteractionCreate } from "./events/interactionCreate.js";
+import {
+  guildMessageCreate,
+  directMessageCreate,
+} from "./events/messageCreate.js";
 import { logger } from "./utils/logger.js";
 
-/*
- * Import {
- * guildMessageCreate,
- * directMessageCreate,
- * } from "./events/messageCreate.js";
- */
-
 const hikari = new Client({
   intents: [
     GatewayIntentBits.Guilds,
@@ -38,15 +35,13 @@ hikari.once(Events.ClientReady, () => {
   analytics.startCron();
 });
 
-/*
- * Hikari.on(Events.MessageCreate, (message) => {
- * if (!message.inGuild()) {
- *  void directMessageCreate(hikari, message);
- *  return;
- * }
- * void guildMessageCreate(hikari, message);
- * });
- */
+hikari.on(Events.MessageCreate, (message) => {
+  if (!message.inGuild()) {
+    void directMessageCreate(hikari, message);
+    return;
+  }
+  void guildMessageCreate(hikari, message);
+});
 
 hikari.on(Events.InteractionCreate, (interaction) => {
   if (interaction.isChatInputCommand()) {