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

frontend/src/app/api/models/request.models.ts

@@ -0,0 +1,103 @@
+/**
+ * Request API Models
+ * Models for license request management
+ */
+
+import { ApprovalStatus } from './approval.models';
+
+export type RequestType = 'NEW_LICENSE' | 'RENEWAL' | 'AMENDMENT' | 'MODIFICATION' | 'CANCELLATION';
+export type RequestStatus = 'DRAFT' | 'SUBMITTED' | 'IN_REVIEW' | 'PENDING_RESUBMISSION' | 'APPROVED' | 'REJECTED' | 'REVOKED' | 'CANCELLED';
+
+export interface CreateRequestDto {
+  applicantId: string;
+  requestType: RequestType;
+  workflowId: string;
+  metadata: Record<string, any>;
+  tokenId?: number;
+}
+
+export interface UpdateRequestDto {
+  businessName?: string;
+  description?: string;
+  metadata?: Record<string, any>;
+}
+
+export interface RequestResponseDto {
+  id: string;
+  requestNumber: string;
+  applicantId: string;
+  requestType: RequestType;
+  status: RequestStatus;
+  currentStageId?: string;
+  metadata: Record<string, any>;
+  blockchainTxHash?: string;
+  tokenId?: string;
+  createdAt: string;
+  updatedAt: string;
+  submittedAt?: string;
+  approvedAt?: string;
+}
+
+export interface DocumentDetailDto {
+  id: string;
+  docType: string;
+  originalFilename: string;
+  currentVersion: number;
+  currentHash: string;
+  minioBucket: string;
+  isActive: boolean;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface ApprovalDetailDto {
+  id: string;
+  departmentId: string;
+  status: ApprovalStatus;
+  remarks?: string;
+  reviewedDocuments: string[];
+  createdAt: string;
+  updatedAt: string;
+  invalidatedAt?: string;
+  invalidationReason?: string;
+}
+
+export interface RequestDetailResponseDto {
+  id: string;
+  requestNumber: string;
+  applicantId: string;
+  requestType: RequestType;
+  status: RequestStatus;
+  currentStageId?: string;
+  metadata: Record<string, any>;
+  blockchainTxHash?: string;
+  tokenId?: string;
+  documents: DocumentDetailDto[];
+  approvals: ApprovalDetailDto[];
+  createdAt: string;
+  updatedAt: string;
+  submittedAt?: string;
+  approvedAt?: string;
+}
+
+export interface PaginatedRequestsResponse {
+  data: RequestResponseDto[];
+  total: number;
+  page: number;
+  limit: number;
+  totalPages: number;
+  hasNextPage: boolean;
+}
+
+export interface RequestFilters {
+  status?: RequestStatus;
+  requestType?: RequestType;
+  applicantId?: string;
+  requestNumber?: string;
+  startDate?: string;
+  endDate?: string;
+  page?: number;
+  limit?: number;
+  sortBy?: 'createdAt' | 'updatedAt' | 'requestNumber' | 'status';
+  sortOrder?: 'ASC' | 'DESC';
+}