feat(web): dashboard session deletion and E2E coverage for issue #150

- Add DeleteSessionAsync to ISessionStore/SessionService (unpublish portfolio card,
  remove bot-created empty forum topic, update batch message).
- Add DeleteSessionForCurrentUserAsync to AuthorizedSessionService with audit log.
- Add delete button + confirmation dialog to GroupDetails.razor.
- Extend dashboard Playwright tests with edit persistence and delete verification.
- Update AuthorizedSessionServiceTests with delete authorization coverage.
- Mark issue #150 as done in tests/e2e/README.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/e2e/runner/Program.cs

@@ -10,6 +10,7 @@ var config = new RunnerConfig
     PhoneNumber = Environment.GetEnvironmentVariable("phone_number")!,
     BotUsername = Environment.GetEnvironmentVariable("TELEGRAM_BOT_USERNAME")!,
     BotToken = Environment.GetEnvironmentVariable("TELEGRAM_BOT_TOKEN")!,
+    DatabaseUrl = Environment.GetEnvironmentVariable("GMRELAY_E2E_DATABASE_URL")!,
 };
 
 using var client = new TelegramUserClient(config);
@@ -30,7 +31,11 @@ try
         JoinLink: "https://example.com/join-e2e");
 
     await newSession.RunAsync(result.Group, inputs);
-    Console.WriteLine("Full scenario completed successfully.");
+    Console.WriteLine("Wizard scenario completed successfully.");
+
+    var lifecycle = new JoinLeaveWaitlistRescheduleScenario(client, config);
+    await lifecycle.RunAsync(result.Group);
+    Console.WriteLine("Lifecycle scenario completed successfully.");
 }
 catch (Exception ex)
 {