feat: initialize mini api skeleton

src/Modules/TakeoutSaaS.Module.Tenancy/TenantProvider.cs

@@ -0,0 +1,13 @@
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Module.Tenancy;
+
+/// <summary>
+/// 默认租户提供者。
+/// </summary>
+public sealed class TenantProvider(ITenantContextAccessor tenantContextAccessor) : ITenantProvider
+{
+    /// <inheritdoc />
+    public long GetCurrentTenantId()
+        => tenantContextAccessor.Current?.TenantId ?? 0;
+}