-เพิ่ม pkg jose ไว้ encrypt secret key

-jwt services/jwt.service.ts
-เพิ่ม  เวลา expire jwt token

ng-ttc-frontend/src/app/component/token-timer/token-timer.component.ts

@@ -0,0 +1,20 @@
+import { Component, OnInit } from '@angular/core';
+import { Observable } from 'rxjs';
+import { JwtService } from '../../services/jwt.service';
+import { CommonModule } from '@angular/common';
+
+@Component({
+  selector: 'app-token-timer',
+  standalone: false,
+  templateUrl: './token-timer.component.html',
+  styleUrls: ['./token-timer.component.css']
+})
+export class TokenTimerComponent implements OnInit {
+  countdown$: Observable<string | null>;
+
+  constructor(private jwtService: JwtService) {
+    this.countdown$ = this.jwtService.countdown$;
+  }
+
+  ngOnInit(): void {}
+}