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/auth.models.ts

@@ -0,0 +1,41 @@
+/**
+ * Auth API Models
+ * Models for authentication and authorization
+ */
+
+import { DepartmentResponseDto } from './department.models';
+import { ApplicantResponseDto } from './applicant.models';
+
+export interface LoginDto {
+  apiKey: string;
+  departmentCode: string;
+}
+
+export interface LoginResponseDto {
+  accessToken: string;
+  department: DepartmentResponseDto;
+}
+
+export interface DigiLockerLoginDto {
+  digilockerId: string;
+  name?: string;
+  email?: string;
+  phone?: string;
+}
+
+export interface DigiLockerLoginResponseDto {
+  accessToken: string;
+  applicant: ApplicantResponseDto;
+}
+
+export interface CurrentUserDto {
+  id: string;
+  type: 'APPLICANT' | 'DEPARTMENT' | 'ADMIN';
+  name: string;
+  email: string;
+  role?: string;
+  departmentCode?: string;
+  departmentId?: string;
+  digilockerId?: string;
+  walletAddress?: string;
+}