A large part of this was possible because of wleroux on discord.
This is a Discord bot that uses the SST Framework
Check apps/discord for the code.
Copy .env-example to .env.local.
Get your discord bot token, app id, and public key from here and paste it in .env.local.
Run pnpm install to install dependencies.
Run pnpm dev to start the bot.
You need to copy ${DiscordEndpoint}/interactions to your discord app's interaction endpoint.
Deploy with Seed. Set the env vars accordingly. The app registers the commands automatically on startup.
Add commands in apps/discord/src/commands. index.ts in that folder exports all the commands and handlers.