fix(email): retire legacy SMTP follow-up

Keep follow-up draft generation but remove the direct application SMTP delivery boundary. Route users to the provider-aware Job email flow and return 410 for legacy API callers.

JobTrackerApi.Tests/AiWorkspaceNotePersistenceTests.cs

@@ -125,9 +125,7 @@ public sealed class AiWorkspaceNotePersistenceTests
         var controller = new JobApplicationsController(
             db,
             summarizer,
-            Mock.Of<IAppEmailSender>(),
             TestHostFactory.CreateUserManager(user).Object,
-            NullLogger<JobApplicationsController>.Instance,
             Mock.Of<ICvTemplateRenderer>(),
             Mock.Of<ICvPdfExporter>());
         controller.ControllerContext = new ControllerContext

JobTrackerApi.Tests/InterviewPrepPersistenceTests.cs

@@ -114,9 +114,7 @@ public sealed class InterviewPrepPersistenceTests
         var controller = new JobApplicationsController(
             db,
             summarizer,
-            Mock.Of<IAppEmailSender>(),
             TestHostFactory.CreateUserManager(null).Object,
-            NullLogger<JobApplicationsController>.Instance,
             Mock.Of<ICvTemplateRenderer>(),
             Mock.Of<ICvPdfExporter>());
         controller.ControllerContext = new ControllerContext

JobTrackerApi.Tests/JobApplicationsApplicationPackageTests.cs

@@ -455,9 +455,7 @@ public sealed class JobApplicationsApplicationPackageTests
         var controller = new JobApplicationsController(
             db,
             summarizer,
-            Mock.Of<IAppEmailSender>(),
             CreateUserManager(user).Object,
-            NullLogger<JobApplicationsController>.Instance,
             renderer ?? new TestCvTemplateRenderer(),
             exporter ?? new TestCvPdfExporter());
         controller.ControllerContext = new ControllerContext

JobTrackerApi.Tests/JobApplicationsAppliedDateHistoryTests.cs

@@ -115,7 +115,7 @@ public sealed class JobApplicationsAppliedDateHistoryTests
 
     private static JobApplicationsController CreateController(JobTrackerContext db, string userId)
     {
-        var controller = new JobApplicationsController(db, Mock.Of<ISummarizerService>(), Mock.Of<IAppEmailSender>(), TestHostFactory.CreateUserManager().Object, NullLogger<JobApplicationsController>.Instance);
+        var controller = new JobApplicationsController(db, Mock.Of<ISummarizerService>(), TestHostFactory.CreateUserManager().Object);
         controller.ControllerContext = new ControllerContext
         {
             HttpContext = new DefaultHttpContext

JobTrackerApi.Tests/JobApplicationsAuthorizationTests.cs

@@ -88,7 +88,7 @@ public sealed class JobApplicationsAuthorizationTests
     {
         var summarizer = new Mock<ISummarizerService>();
         var users = TestHostFactory.CreateUserManager();
-        return new JobApplicationsController(db, summarizer.Object, Mock.Of<IAppEmailSender>(), users.Object, NullLogger<JobApplicationsController>.Instance)
+        return new JobApplicationsController(db, summarizer.Object, users.Object)
         {
             ControllerContext = new ControllerContext
             {

JobTrackerApi.Tests/JobApplicationsEndpointBehaviorTests.cs

@@ -295,7 +295,7 @@ public sealed class JobApplicationsEndpointBehaviorTests
         summarizer.Setup(x => x.SummarizeSectionAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<int>(), It.IsAny<int>())).ReturnsAsync("generated text");
         var users = CreateUserManager();
 
-        var controller = new JobApplicationsController(db, summarizer.Object, Mock.Of<IAppEmailSender>(), users.Object, NullLogger<JobApplicationsController>.Instance);
+        var controller = new JobApplicationsController(db, summarizer.Object, users.Object);
         controller.ControllerContext = new ControllerContext
         {
             HttpContext = new DefaultHttpContext

JobTrackerApi.Tests/JobApplicationsFollowUpDraftTests.cs

@@ -103,9 +103,29 @@ public sealed class JobApplicationsFollowUpDraftTests
         Assert.Contains("Maria Recruiter", payload.LastCorrespondenceFrom ?? string.Empty);
     }
 
+    [Fact]
+    public void Legacy_follow_up_delivery_is_gone_and_has_no_smtp_dependency()
+    {
+        using var db = CreateDb();
+        var controller = CreateController(db, Mock.Of<ISummarizerService>(), "user-1");
+
+        var result = controller.SendFollowUp(42, new SendFollowUpRequest(
+            "recruiter@example.test",
+            "Synthetic subject",
+            "Synthetic body",
+            DateTime.UtcNow.AddDays(3)), default);
+
+        var gone = Assert.IsType<ObjectResult>(result);
+        Assert.Equal(StatusCodes.Status410Gone, gone.StatusCode);
+        Assert.Equal("Legacy email delivery retired", Assert.IsType<ProblemDetails>(gone.Value).Title);
+        Assert.Empty(db.Correspondences);
+        Assert.DoesNotContain(typeof(JobApplicationsController).GetConstructors().Single().GetParameters(),
+            parameter => parameter.ParameterType == typeof(IAppEmailSender));
+    }
+
     private static JobApplicationsController CreateController(JobTrackerContext db, ISummarizerService summarizer, string userId)
     {
-        var controller = new JobApplicationsController(db, summarizer, Mock.Of<IAppEmailSender>(), CreateUserManager().Object, NullLogger<JobApplicationsController>.Instance);
+        var controller = new JobApplicationsController(db, summarizer, CreateUserManager().Object);
         controller.ControllerContext = new ControllerContext
         {
             HttpContext = new DefaultHttpContext

JobTrackerApi.Tests/JobApplicationsMariaDraftTests.cs

@@ -41,7 +41,7 @@ public sealed class JobApplicationsMariaDraftTests
         summarizer.Setup(x => x.SummarizeSectionAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<int>(), It.IsAny<int>())).ReturnsAsync("generated text");
         var users = CreateUserManager();
 
-        var controller = new JobApplicationsController(db, summarizer.Object, Mock.Of<IAppEmailSender>(), users.Object, NullLogger<JobApplicationsController>.Instance);
+        var controller = new JobApplicationsController(db, summarizer.Object, users.Object);
         controller.ControllerContext = new ControllerContext
         {
             HttpContext = new DefaultHttpContext

JobTrackerApi.Tests/JobApplicationsWorkflowSignalsTests.cs

@@ -110,7 +110,7 @@ public sealed class JobApplicationsWorkflowSignalsTests
 
     private static JobApplicationsController CreateController(JobTrackerContext db, string userId)
     {
-        var controller = new JobApplicationsController(db, Mock.Of<ISummarizerService>(), Mock.Of<IAppEmailSender>(), CreateUserManager().Object, NullLogger<JobApplicationsController>.Instance);
+        var controller = new JobApplicationsController(db, Mock.Of<ISummarizerService>(), CreateUserManager().Object);
         controller.ControllerContext = new ControllerContext
         {
             HttpContext = new DefaultHttpContext