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/common/utils/request-number.util.ts

@@ -0,0 +1,41 @@
+import { RequestType } from '../enums';
+import { REQUEST_NUMBER_PREFIX } from '../constants';
+
+export class RequestNumberUtil {
+  /**
+   * Generate unique request number
+   * Format: {PREFIX}-{YEAR}-{SEQUENCE}
+   * Example: RL-2024-000001
+   */
+  static generate(requestType: RequestType, sequence: number): string {
+    const prefix = REQUEST_NUMBER_PREFIX[requestType] || 'RQ';
+    const year = new Date().getFullYear();
+    const paddedSequence = sequence.toString().padStart(6, '0');
+    return `${prefix}-${year}-${paddedSequence}`;
+  }
+
+  /**
+   * Parse request number to extract components
+   */
+  static parse(requestNumber: string): {
+    prefix: string;
+    year: number;
+    sequence: number;
+  } | null {
+    const match = requestNumber.match(/^([A-Z]+)-(\d{4})-(\d+)$/);
+    if (!match) return null;
+    
+    return {
+      prefix: match[1],
+      year: parseInt(match[2], 10),
+      sequence: parseInt(match[3], 10),
+    };
+  }
+
+  /**
+   * Validate request number format
+   */
+  static isValid(requestNumber: string): boolean {
+    return /^[A-Z]+-\d{4}-\d{6}$/.test(requestNumber);
+  }
+}