feat: initialize Discord bot project with basic command structure

- Add package.json with dependencies and scripts for building, testing, and running the bot.
- Implement bot startup logic in src/bot.ts, handling interactions and commands.
- Create command structure in src/commands/index.ts, including a ping command in src/commands/ping.ts.
- Add configuration loading from environment variables in src/config.ts.
- Implement command registration in Discord API in src/deploy-commands.ts.
- Bootstrap the bot in src/index.ts.
- Configure TypeScript settings in tsconfig.json.

src/bot.ts

@@ -0,0 +1,56 @@
+import {
+  Client,
+  Events,
+  GatewayIntentBits,
+  Interaction,
+  Partials,
+} from "discord.js";
+import { commandMap } from "./commands";
+import { BotConfig } from "./config";
+
+export async function startBot(config: BotConfig): Promise<Client> {
+  const client = new Client({
+    intents: [GatewayIntentBits.Guilds],
+    partials: [Partials.Channel],
+  });
+
+  client.once(Events.ClientReady, (readyClient) => {
+    console.log(`Bot ready as ${readyClient.user.tag}`);
+  });
+
+  client.on(Events.InteractionCreate, async (interaction: Interaction) => {
+    if (!interaction.isChatInputCommand()) {
+      return;
+    }
+
+    const command = commandMap.get(interaction.commandName);
+    if (!command) {
+      await interaction.reply({
+        content: `Unknown command: ${interaction.commandName}`,
+        ephemeral: true,
+      });
+      return;
+    }
+
+    try {
+      await command.execute(interaction);
+    } catch (error: unknown) {
+      console.error(`Command failed: ${interaction.commandName}`, error);
+
+      if (interaction.replied || interaction.deferred) {
+        await interaction.followUp({
+          content: "Command failed. Try again.",
+          ephemeral: true,
+        });
+      } else {
+        await interaction.reply({
+          content: "Command failed. Try again.",
+          ephemeral: true,
+        });
+      }
+    }
+  });
+
+  await client.login(config.discordToken);
+  return client;
+}