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src/config/env.ts

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+import { z } from 'zod';
+
+/**
+ * Schéma des variables d'environnement.
+ * Toute nouvelle variable doit passer par ce schéma → fail-fast au boot.
+ */
+const envSchema = z.object({
+  NODE_ENV: z.enum(['development', 'test', 'production']).default('development'),
+
+  // DB
+  DATABASE_PROVIDER: z.enum(['sqlite', 'postgresql']).default('sqlite'),
+  DATABASE_URL: z.string().min(1),
+
+  // App
+  PORT: z.coerce.number().int().positive().default(3000),
+  APP_URL: z.string().url().default('http://localhost:3000'),
+
+  // Discovery
+  DISCOVERY_DEFAULT_CIDRS: z.string().default('192.168.1.0/24'),
+  DISCOVERY_DEFAULT_PORTS: z.string().default('22,80,443,8080'),
+  DISCOVERY_PING_TIMEOUT: z.coerce.number().int().positive().default(1000),
+  DISCOVERY_PORT_TIMEOUT: z.coerce.number().int().positive().default(800),
+  DISCOVERY_CONCURRENCY: z.coerce.number().int().positive().default(32),
+  DISCOVERY_ENABLE_PING: z.coerce.boolean().default(true),
+  DISCOVERY_ENABLE_PORT_SCAN: z.coerce.boolean().default(true),
+  DISCOVERY_ENABLE_ARP: z.coerce.boolean().default(true),
+  DISCOVERY_ENABLE_MDNS: z.coerce.boolean().default(true),
+
+  // Logs
+  LOG_LEVEL: z.enum(['trace', 'debug', 'info', 'warn', 'error']).default('info'),
+});
+
+export type Env = z.infer<typeof envSchema>;
+
+function loadEnv(): Env {
+  const parsed = envSchema.safeParse(process.env);
+  if (!parsed.success) {
+    console.error('❌ Variables d\'environnement invalides :', parsed.error.flatten().fieldErrors);
+    throw new Error('Configuration invalide');
+  }
+  return parsed.data;
+}
+
+export const env = loadEnv();