feat(holiday-system): implement comprehensive holiday management features

- Added holiday types and organization holidays management with CRUD operations.
- Introduced country holidays import functionality using the date-holidays npm package.
- Created database migrations for holiday types and organization holidays tables.
- Developed a holiday calendar component for visual representation and management of holidays.
- Enhanced API routes for holiday-related operations and integrated them into the admin center.
- Updated frontend localization for holiday management features.
- Implemented scripts for populating holidays in the database for 200+ countries.

worklenz-frontend/src/api/holiday/holiday.api.service.ts

@@ -0,0 +1,68 @@
+import { API_BASE_URL } from '@/shared/constants';
+import apiClient from '../api-client';
+import { IServerResponse } from '@/types/common.types';
+import {
+  IHolidayType,
+  IOrganizationHoliday,
+  ICountryHoliday,
+  IAvailableCountry,
+  ICreateHolidayRequest,
+  IUpdateHolidayRequest,
+  IImportCountryHolidaysRequest,
+  IHolidayCalendarEvent,
+} from '@/types/holiday/holiday.types';
+
+const rootUrl = `${API_BASE_URL}/holidays`;
+
+export const holidayApiService = {
+  // Holiday types
+  getHolidayTypes: async (): Promise<IServerResponse<IHolidayType[]>> => {
+    const response = await apiClient.get<IServerResponse<IHolidayType[]>>(`${rootUrl}/types`);
+    return response.data;
+  },
+
+  // Organization holidays
+  getOrganizationHolidays: async (year?: number): Promise<IServerResponse<IOrganizationHoliday[]>> => {
+    const params = year ? `?year=${year}` : '';
+    const response = await apiClient.get<IServerResponse<IOrganizationHoliday[]>>(`${rootUrl}/organization${params}`);
+    return response.data;
+  },
+
+  createOrganizationHoliday: async (data: ICreateHolidayRequest): Promise<IServerResponse<any>> => {
+    const response = await apiClient.post<IServerResponse<any>>(`${rootUrl}/organization`, data);
+    return response.data;
+  },
+
+  updateOrganizationHoliday: async (id: string, data: IUpdateHolidayRequest): Promise<IServerResponse<any>> => {
+    const response = await apiClient.put<IServerResponse<any>>(`${rootUrl}/organization/${id}`, data);
+    return response.data;
+  },
+
+  deleteOrganizationHoliday: async (id: string): Promise<IServerResponse<any>> => {
+    const response = await apiClient.delete<IServerResponse<any>>(`${rootUrl}/organization/${id}`);
+    return response.data;
+  },
+
+  // Country holidays
+  getAvailableCountries: async (): Promise<IServerResponse<IAvailableCountry[]>> => {
+    const response = await apiClient.get<IServerResponse<IAvailableCountry[]>>(`${rootUrl}/countries`);
+    return response.data;
+  },
+
+  getCountryHolidays: async (countryCode: string, year?: number): Promise<IServerResponse<ICountryHoliday[]>> => {
+    const params = year ? `?year=${year}` : '';
+    const response = await apiClient.get<IServerResponse<ICountryHoliday[]>>(`${rootUrl}/countries/${countryCode}${params}`);
+    return response.data;
+  },
+
+  importCountryHolidays: async (data: IImportCountryHolidaysRequest): Promise<IServerResponse<any>> => {
+    const response = await apiClient.post<IServerResponse<any>>(`${rootUrl}/import`, data);
+    return response.data;
+  },
+
+  // Calendar view
+  getHolidayCalendar: async (year: number, month: number): Promise<IServerResponse<IHolidayCalendarEvent[]>> => {
+    const response = await apiClient.get<IServerResponse<IHolidayCalendarEvent[]>>(`${rootUrl}/calendar?year=${year}&month=${month}`);
+    return response.data;
+  },
+};