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/auth/dto/request/validate-session.dto.ts

@@ -0,0 +1,15 @@
+import { IsNotEmpty, IsString, IsEnum, IsOptional } from 'class-validator';
+
+export class ValidateSessionDTO {
+  @IsNotEmpty()
+  @IsString()
+  code: string;
+
+  @IsString()
+  @IsOptional()
+  session?: string;
+
+  @IsNotEmpty()
+  @IsEnum(['password', 'mfa'])
+  type: 'password' | 'mfa';
+}