feat: initialize booster role bot with database and Discord integration

- Add drizzle configuration for SQLite database
- Create package.json with necessary dependencies and scripts
- Implement configuration loading for Discord bot
- Define permissions for roles
- Set up database schema for booster roles
- Create Discord client and commands for managing booster roles
- Handle guild member updates to manage roles based on boost status
- Implement boost eligibility checks and role management logic
- Add tests for boost eligibility and role guards
- Create service for managing booster roles with in-memory storage for testing
- Configure TypeScript settings for the project

src/discord/events/guildMemberUpdate.ts

@@ -0,0 +1,11 @@
+import type { GuildMember } from "discord.js";
+import type { BoosterRoleService } from "../../services/boosterRoleService";
+
+export async function handleGuildMemberUpdate(oldMember: GuildMember, newMember: GuildMember, service: BoosterRoleService): Promise<void> {
+  const hadBoost = Boolean(oldMember.premiumSince);
+  const hasBoost = Boolean(newMember.premiumSince);
+
+  if (hadBoost && !hasBoost) {
+    await service.removeRoleForLostBoost({ guildId: newMember.guild.id, userId: newMember.id });
+  }
+}