feat: add tenant resolve and health endpoints

Tiku.Api/Contracts/HealthDtos.cs

@@ -0,0 +1,6 @@
+namespace Tiku.Api.Contracts;
+
+public sealed record HealthResponseDto(
+    string Status,
+    string Service,
+    DateTimeOffset CheckedAt);

Tiku.Api/Contracts/TenantDtos.cs

@@ -0,0 +1,56 @@
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json;
+using Tiku.Domain.Common;
+using Tiku.Domain.Tenancy;
+
+namespace Tiku.Api.Contracts;
+
+public sealed class TenantResolveQueryDto
+{
+    [StringLength(253)]
+    [Description("要解析的访问域名，例如 student.example.com。本地开发也可以直接传 localhost。")]
+    public string? Host { get; set; }
+
+    [StringLength(100)]
+    [Description("租户编码；本地开发或无独立域名时使用，例如 master。")]
+    public string? TenantCode { get; set; }
+}
+
+public sealed record TenantResolveResponseDto(
+    PublicTenantDto Tenant,
+    PublicTenantBrandingDto Branding,
+    JsonElement Features,
+    JsonElement AdminFeatures,
+    JsonElement PublicConfig);
+
+public sealed record PublicTenantDto(
+    Guid Id,
+    string Slug,
+    string Name,
+    TenantStatus Status,
+    TenantMode Mode,
+    string? Host);
+
+public sealed record PublicTenantBrandingDto(
+    string? BrandName,
+    string? ShortName,
+    string? Slogan,
+    string? LogoUrl,
+    string? FaviconUrl,
+    string? ServiceWechat,
+    string? ServiceAccountName,
+    JsonElement Theme,
+    JsonElement PublicAssets)
+{
+    public static PublicTenantBrandingDto Empty { get; } = new(
+        null,
+        null,
+        null,
+        null,
+        null,
+        null,
+        null,
+        JsonDefaults.Object(),
+        JsonDefaults.Object());
+}