feat: implement change password functionality with dialog and service integration

src/app/domains/pos/services/password.ts

@@ -0,0 +1,14 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class PosChangePasswordService {
+  constructor(private readonly http: HttpClient) {}
+
+  changePassword(password: string): Observable<unknown> {
+    return this.http.put('/api/v1/pos/update-password', { password });
+  }
+}