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/trailers/entities/trailer.entity.ts

@@ -0,0 +1,41 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  OneToMany,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+import { ContentStatus } from 'src/contents/enums/content-status.enum';
+import { Content } from 'src/contents/entities/content.entity';
+import { Project } from 'src/projects/entities/project.entity';
+
+@Entity('trailers')
+export class Trailer {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  file: string;
+
+  @Column({
+    type: 'varchar',
+    default: 'processing',
+  })
+  status: ContentStatus;
+
+  @Column('json', { nullable: true })
+  metadata?: any;
+
+  @CreateDateColumn({ type: 'timestamptz', name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ type: 'timestamptz', name: 'updated_at' })
+  updatedAt: Date;
+
+  @OneToMany(() => Content, (content) => content.trailer)
+  contents: Content[];
+
+  @OneToMany(() => Project, (project) => project.trailer)
+  projects: Project[];
+}