add environment variable for API URL and update client configuration

.env.example

@@ -0,0 +1 @@
+NEXT_PUBLIC_API_URL=http://api.example.com/api

src/hey-api-config.ts

@@ -1,6 +1,6 @@
-import type { CreateClientConfig } from "@/lib/client/client.gen";
+import type {CreateClientConfig} from "@/lib/client/client.gen";
 
 export const createClientConfig: CreateClientConfig = config => ({
     ...config,
-    baseUrl: "http://crm.logidex.ru/api",
+    baseUrl: process.env.NEXT_PUBLIC_API_URL,
 });