feat: implement MongoDB connection logic

src/config/db.ts

@@ -0,0 +1,15 @@
+import mongoose from "mongoose";
+import { env } from "./env.js";
+
+export async function connectDB(): Promise<void> {
+  try {
+    mongoose.set("strictQuery", true);
+
+    await mongoose.connect(env.mongoUri);
+
+    console.log("Connected to MongoDB");
+  } catch (error) {
+    console.error("Failed to connect to MongoDB", error);
+    process.exit(1);
+  }
+}