feat: add api/env

Author: xiaoyu2er

apps/docs/src/app/api/env/route.ts

@@ -0,0 +1,7 @@
+export const GET = async () => {
+  return new Response(JSON.stringify(process.env), {
+    headers: {
+      'Content-Type': 'application/json',
+    },
+  });
+};