feat: add Master Admin application functionality

src/app/features/global-masters/timezones/data-access/timezone.service.ts

@@ -0,0 +1,45 @@
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { Injectable, inject } from '@angular/core';
+import { Observable } from 'rxjs';
+
+import { TIMEZONE_ENDPOINTS } from './timezone.endpoints';
+import {
+  CreateTimezoneRequest,
+  TimezoneDto,
+  TimezoneLookupDto,
+  UpdateTimezoneRequest
+} from '../models/timezone.model';
+import {
+  DataTableQuery,
+  DataTableResult
+} from '../../../../shared/components/data-table/data-table.types';
+
+@Injectable({ providedIn: 'root' })
+export class TimezoneService {
+  private readonly http = inject(HttpClient);
+
+  getDataTable(query: DataTableQuery): Observable<DataTableResult<TimezoneDto>> {
+    return this.http.post<DataTableResult<TimezoneDto>>(TIMEZONE_ENDPOINTS.dataTable, query);
+  }
+
+  getById(id: string): Observable<TimezoneDto> {
+    return this.http.get<TimezoneDto>(TIMEZONE_ENDPOINTS.getById(id));
+  }
+
+  create(request: CreateTimezoneRequest): Observable<TimezoneDto> {
+    return this.http.post<TimezoneDto>(TIMEZONE_ENDPOINTS.create, request);
+  }
+
+  update(id: string, request: UpdateTimezoneRequest): Observable<TimezoneDto> {
+    return this.http.put<TimezoneDto>(TIMEZONE_ENDPOINTS.update(id), request);
+  }
+
+  autocomplete(term: string | null, limit = 10): Observable<readonly TimezoneLookupDto[]> {
+    const normalizedTerm = term?.trim() || null;
+    let params = new HttpParams().set('limit', limit);
+    if (normalizedTerm !== null) {
+      params = params.set('term', normalizedTerm);
+    }
+    return this.http.get<readonly TimezoneLookupDto[]>(TIMEZONE_ENDPOINTS.autocomplete, { params });
+  }
+}