feat: modularize external providers

Tiku.Application/Auth/ISmsProvider.cs

@@ -0,0 +1,23 @@
+using Tiku.Domain.Tenancy;
+
+namespace Tiku.Application.Auth;
+
+public sealed record SmsProviderSendRequest(
+    Guid TenantId,
+    string Phone,
+    SmsPurpose Purpose,
+    string Code,
+    string? IpAddress,
+    string? UserAgent);
+
+public sealed record SmsProviderSendResult(
+    string Provider,
+    string Status,
+    string? MessageId = null);
+
+public interface ISmsProvider
+{
+    Task<SmsProviderSendResult> SendAsync(
+        SmsProviderSendRequest request,
+        CancellationToken cancellationToken = default);
+}