Implement requested Jiaowu workflow updates

src/Jiaowu.Api/Program.cs

@@ -8,6 +8,7 @@ using Jiaowu.Api.Infrastructure.Grades;
 using Jiaowu.Api.Infrastructure.Configuration;
 using Jiaowu.Api.Infrastructure.Auth;
 using Jiaowu.Api.Infrastructure.Analytics;
+using Jiaowu.Api.Infrastructure.AcademicCalendar;
 using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Exams;
 using Jiaowu.Api.Infrastructure.Facilities;
@@ -321,6 +322,11 @@ builder.Services.AddHttpClient<ClickHouseAnalyticsClient>((_, client) =>
     client.BaseAddress = new Uri(clickHouseAnalyticsOptions.Endpoint.TrimEnd('/') + "/");
     client.Timeout = TimeSpan.FromSeconds(30);
 });
+builder.Services.AddHttpClient<HolidayCnClient>(client =>
+{
+    client.BaseAddress = new Uri("https://cdn.jsdelivr.net/gh/NateScarlet/holiday-cn@master/");
+    client.Timeout = TimeSpan.FromSeconds(15);
+});
 builder.Services.Configure<OfficialDocumentOptions>(
     builder.Configuration.GetSection(OfficialDocumentOptions.SectionName));
 builder.Services.AddDbContextPool<AppDbContext>((services, options) =>