feat: Goa GEL Blockchain e-Licensing Platform - Full Stack Implementation

Complete implementation of the Goa Government e-Licensing platform with:

Backend:
- NestJS API with JWT authentication
- PostgreSQL database with Knex ORM
- Redis caching and session management
- MinIO document storage
- Hyperledger Besu blockchain integration
- Multi-department workflow system
- Comprehensive API tests (266/282 passing)

Frontend:
- Angular 21 with standalone components
- Angular Material + TailwindCSS UI
- Visual workflow builder
- Document upload with progress tracking
- Blockchain explorer integration
- Role-based dashboards (Admin, Department, Citizen)
- E2E tests with Playwright (37 tests)

Infrastructure:
- Docker Compose orchestration
- Blockscout blockchain explorer
- Development and production configurations

backend/src/modules/documents/dto/document-response.dto.ts

@@ -0,0 +1,72 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class DocumentResponseDto {
+  @ApiProperty({
+    description: 'Document ID (UUID)',
+  })
+  id: string;
+
+  @ApiProperty({
+    description: 'Request ID (UUID)',
+  })
+  requestId: string;
+
+  @ApiProperty({
+    description: 'Document type',
+    example: 'FIRE_SAFETY_CERTIFICATE',
+  })
+  docType: string;
+
+  @ApiProperty({
+    description: 'Original filename',
+  })
+  originalFilename: string;
+
+  @ApiProperty({
+    description: 'Current version number',
+  })
+  currentVersion: number;
+
+  @ApiProperty({
+    description: 'SHA-256 hash of current version',
+  })
+  currentHash: string;
+
+  @ApiProperty({
+    description: 'SHA-256 hash of current version (alias)',
+    required: false,
+  })
+  fileHash?: string;
+
+  @ApiProperty({
+    description: 'MinIO bucket name',
+  })
+  minioBucket: string;
+
+  @ApiProperty({
+    description: 'Whether document is active',
+  })
+  isActive: boolean;
+
+  @ApiProperty({
+    description: 'Number of times the document has been downloaded',
+    required: false,
+  })
+  downloadCount?: number;
+
+  @ApiProperty({
+    description: 'Timestamp of last download',
+    required: false,
+  })
+  lastDownloadedAt?: Date;
+
+  @ApiProperty({
+    description: 'Document creation timestamp',
+  })
+  createdAt: Date;
+
+  @ApiProperty({
+    description: 'Document last update timestamp',
+  })
+  updatedAt: Date;
+}