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/bot/src/modules/giveaways/index.ts

@@ -1,3 +1,3 @@
 export { giveawayCommands } from './commands.js';
 export { isGiveawayButton, handleGiveawayButton } from './buttons.js';
-export { endGiveaway, scheduleGiveawayEnd } from './service.js';
+export { endGiveaway, scheduleGiveawayEnd, runGiveawayCreateJob } from './service.js';