feat(nestjs): migrate to NestJS

packages/server/src/common/config/lemonsqueezy.ts

@@ -0,0 +1,7 @@
+import { registerAs } from '@nestjs/config';
+
+export default registerAs('lemonsqueezy', () => ({
+  apiKey: process.env.LEMONSQUEEZY_API_KEY,
+  storeId: process.env.LEMONSQUEEZY_STORE_ID,
+  webhookSecret: process.env.LEMONSQUEEZY_WEBHOOK_SECRET,
+}));