Enhance giveaway job handling and update environment configuration

- Added support for a new `giveawayCreate` job in the bot's job processing, allowing for giveaways to be created via the WebUI.
- Introduced `runGiveawayCreateJob` function to handle the creation of giveaways, ensuring consistent behavior with existing commands.
- Updated `.env.example` to clarify the usage of `BOT_TOKEN` for both the bot and WebUI, enhancing documentation for environment variables.
- Added `bullmq` dependency in the WebUI package for job management capabilities.

apps/webui/src/lib/env.ts

@@ -9,6 +9,14 @@ const EnvSchema = z.object({
   REDIS_URL: z.string().url(),
   BOT_CLIENT_ID: z.string().min(1),
   BOT_CLIENT_SECRET: z.string().min(1),
+  /**
+   * Discord bot token. The WebUI does not run a discord.js Client/gateway
+   * connection, but uses this token for narrow, on-demand Discord REST calls
+   * (e.g. building a guild backup snapshot) and to enqueue BullMQ jobs that
+   * the bot process picks up for actions that require a live Client
+   * (posting messages, restoring a backup).
+   */
+  BOT_TOKEN: z.string().min(1),
   WEBUI_URL: z.string().url().default('http://localhost:3000'),
   SESSION_SECRET: z.string().min(32, 'SESSION_SECRET must be at least 32 characters long'),
   SENTRY_DSN: z.string().optional(),