Stage after merging with project files

src/config/env.js

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+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const requiredKeys = ['DB_HOST', 'DB_PORT', 'DB_NAME', 'DB_USER', 'DB_PASSWORD'];
+
+for (const key of requiredKeys) {
+  if (!process.env[key]) {
+    throw new Error(`Missing required environment variable: ${key}`);
+  }
+}
+
+export const env = {
+  port: Number(process.env.PORT || 3000),
+  db: {
+    host: process.env.DB_HOST,
+    port: Number(process.env.DB_PORT),
+    database: process.env.DB_NAME,
+    user: process.env.DB_USER,
+    password: process.env.DB_PASSWORD,
+    connectionLimit: Number(process.env.DB_CONNECTION_LIMIT || 5)
+  }
+};