refactor(api): simplify backend proxy to api and biz paths

.env.example

@@ -1,5 +1,2 @@
 # Server-only backend origin. Do not expose this as a NEXT_PUBLIC variable.
 BACKEND_ORIGIN=http://localhost:8000
-
-# Browser requests stay on the Next.js origin and are rewritten server-side.
-NEXT_PUBLIC_API_URL=/backend/

next.config.ts

@@ -11,8 +11,8 @@ const nextConfig: NextConfig = {
   async rewrites() {
     return [
       {
-        source: '/backend/:path*',
-        destination: `${backendOrigin}/:path*`,
+        source: '/:namespace(api|biz)/:path*',
+        destination: `${backendOrigin}/:namespace/:path*`,
       },
     ];
   },

src/constants/secrect.constant.ts

@@ -1,3 +1,3 @@
 export const ENV_CONSTANT = {
-  BASE_API_URL: process.env.NEXT_PUBLIC_API_URL,
+  BASE_API_URL: '/',
 };