feat: implement command registration for booster role bot and add tests

src/index.ts

@@ -1,10 +1,16 @@
 import { loadConfig } from "./config";
 import { createDiscordClient } from "./discord/client";
+import { registerGuildCommandsWithToken } from "./discord/registerCommands";
 
 const config = loadConfig();
+await registerGuildCommandsWithToken(config.discordToken, {
+  clientId: config.discordClientId,
+  guildId: config.discordGuildId
+});
+
 const client = createDiscordClient();
 
-client.once("ready", () => {
+client.once("clientReady", () => {
   console.log(`Logged in as ${client.user?.tag ?? "unknown bot"}`);
 });