feat: implement comprehensive item management system with admin UI, API, and asset handling utilities.

shared/lib/env.ts

@@ -8,6 +8,9 @@ const envSchema = z.object({
     PORT: z.coerce.number().default(3000),
     HOST: z.string().default("127.0.0.1"),
     ADMIN_TOKEN: z.string().min(8, "ADMIN_TOKEN must be at least 8 characters").optional(),
+    // Asset URL configuration (for production with custom domains)
+    ASSETS_BASE_URL: z.string().url().optional(),
+    WEB_URL: z.string().url().optional(),
 });
 
 const parsedEnv = envSchema.safeParse(process.env);