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/package.json

@@ -21,6 +21,7 @@
     "@radix-ui/react-separator": "^1.1.12",
     "@radix-ui/react-slot": "^1.3.0",
     "@radix-ui/react-switch": "^1.3.4",
+    "bullmq": "^5.34.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "dotenv": "^16.4.7",