Implement backend API and database services in Docker setup

- Added a new `api` service for the NestJS backend, including health checks and dependencies on PostgreSQL, Redis, and MinIO.
- Introduced PostgreSQL and Redis services with health checks and configurations for data persistence.
- Added MinIO for S3-compatible object storage and a one-shot service to initialize required buckets.
- Updated the Nginx configuration to proxy requests to the new backend API and MinIO storage.
- Enhanced the Dockerfile to support the new API environment variables and configurations.
- Updated the `package.json` and `package-lock.json` to include new dependencies for QR code generation and other utilities.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/subscriptions/enums/status.enum.ts

@@ -0,0 +1,10 @@
+export const paymentStatus = [
+  'created',
+  'processing',
+  'succeeded',
+  'rejected',
+  'cancelled',
+  'paused',
+  'expired',
+] as const;
+export type PaymentStatus = (typeof paymentStatus)[number];