Import source: backend/src/config/env

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

backend/src/config/env.ts

@@ -0,0 +1,23 @@
+import { z } from 'zod';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const envSchema = z.object({
+  NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
+  PORT: z.coerce.number().default(4000),
+  HOST: z.string().default('0.0.0.0'),
+  DATABASE_URL: z.string().url(),
+  REDIS_URL: z.string().url().default('redis://localhost:6379'),
+  JWT_SECRET: z.string().min(32),
+});
+
+const parsed = envSchema.safeParse(process.env);
+
+if (!parsed.success) {
+  console.error('❌ Invalid environment configuration:', parsed.error.format());
+  process.exit(1);
+}
+
+export const env = parsed.data;
+export type Env = z.infer<typeof envSchema>;