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/season/dto/request/create-season-rent.entity.ts

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+import { IsString } from 'class-validator';
+
+export class CreateSeasonRentDto {
+  @IsString()
+  id: string; // Season id
+}

backend/src/season/dto/request/create-season.dto.entity.ts

@@ -0,0 +1,25 @@
+import { IsString, IsNumber, IsOptional, IsBoolean } from 'class-validator';
+
+export class CreateSeasonDto {
+  @IsString()
+  projectId: string;
+
+  @IsNumber()
+  seasonNumber: number;
+
+  @IsOptional()
+  @IsNumber()
+  rentalPrice?: number;
+
+  @IsOptional()
+  @IsString()
+  title?: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}

backend/src/season/dto/request/update-season.dto.entity.ts

@@ -0,0 +1,8 @@
+import { IsOptional, IsUUID } from 'class-validator';
+import { CreateSeasonDto } from './create-season.dto.entity';
+
+export class UpdateSeasonDto extends CreateSeasonDto {
+  @IsUUID()
+  @IsOptional()
+  id?: string;
+}

backend/src/season/dto/response/season-rent.dto.ts

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+import { ProjectDTO } from 'src/projects/dto/response/project.dto';
+import { SeasonRent } from 'src/season/entities/season-rents.entity';
+import { SeasonDTO } from './season.dto';
+import { ContentDTO } from 'src/contents/dto/response/content.dto';
+
+export class SeasonRentDTO {
+  id: string;
+  status: 'active' | 'expired';
+  usdAmount: number;
+  createdAt: Date;
+  expiresAt: Date;
+  title: string;
+  project: ProjectDTO;
+  season: SeasonDTO;
+  contents: ContentDTO[];
+
+  constructor(seasonRent: SeasonRent) {
+    this.id = seasonRent.id;
+    const expiresAt = new Date(seasonRent.createdAt);
+    expiresAt.setDate(expiresAt.getDate() + 2);
+    this.status =
+      seasonRent.status == 'paid' && new Date() < expiresAt
+        ? 'active'
+        : 'expired';
+    this.usdAmount = seasonRent.usdAmount;
+    this.project = seasonRent?.season?.project
+      ? new ProjectDTO(seasonRent.season.project)
+      : undefined;
+    this.title =
+      seasonRent.season?.title || seasonRent.season?.project?.title || '';
+    this.createdAt = seasonRent.createdAt;
+    this.expiresAt = expiresAt;
+    this.contents =
+      seasonRent.season?.contents?.map((content) => new ContentDTO(content)) ||
+      [];
+    this.season = seasonRent?.season
+      ? new SeasonDTO(seasonRent.season)
+      : undefined;
+  }
+}

backend/src/season/dto/response/season.dto.ts

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+import { ContentDTO } from 'src/contents/dto/response/content.dto';
+import { Season } from 'src/season/entities/season.entity';
+
+export class SeasonDTO {
+  id: string;
+  projectId: string;
+  seasonNumber: number;
+  rentalPrice: number;
+  title?: string;
+  description?: string;
+  isActive: boolean;
+  createdAt: Date;
+  updatedAt: Date;
+  contents?: ContentDTO[];
+
+  constructor(season: Season) {
+    this.id = season.id;
+    this.projectId = season.projectId;
+    this.seasonNumber = season.seasonNumber;
+    this.rentalPrice = season.rentalPrice;
+    this.title = season.title;
+    this.description = season.description;
+    this.isActive = season.isActive;
+    this.createdAt = season.createdAt;
+    this.updatedAt = season.updatedAt;
+    this.contents =
+      season?.contents?.map((content) => new ContentDTO(content)) || [];
+  }
+}