refactor: 移除平台侧能力并收紧租户隔离

tests/TakeoutSaaS.Application.Tests/App/Tenants/Validators/CreateAnnouncementCommandValidatorTests.cs

@@ -62,7 +62,7 @@ public sealed class CreateAnnouncementCommandValidatorTests
     }
 
     [Fact]
-    public void GivenTenantIdZeroAndNotPlatform_WhenValidate_ThenShouldHaveError()
+    public void GivenTenantIdZero_WhenValidate_ThenShouldHaveError()
     {
         // Arrange
         var command = AnnouncementTestData.CreateValidCreateCommand() with
@@ -75,7 +75,23 @@ public sealed class CreateAnnouncementCommandValidatorTests
         var result = _validator.TestValidate(command);
 
         // Assert
-        result.ShouldHaveValidationErrorFor(x => x);
+        result.ShouldHaveValidationErrorFor(x => x.TenantId);
+    }
+
+    [Fact]
+    public void GivenPlatformPublisherScope_WhenValidate_ThenShouldHaveError()
+    {
+        // Arrange
+        var command = AnnouncementTestData.CreateValidCreateCommand() with
+        {
+            PublisherScope = PublisherScope.Platform
+        };
+
+        // Act
+        var result = _validator.TestValidate(command);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor(x => x.PublisherScope);
     }
 
     [Fact]