Implement stream cookie deletion in logout and account deletion endpoints: add DeleteStreamCookie method to remove the stream cookie upon user logout and account deletion, enhancing security by preventing access to streams after token expiration.

backend/src/TeleWave.Api/Endpoints/AuthEndpoints.cs

@@ -134,6 +134,7 @@ public static class AuthEndpoints
             await sender.Send(new LogoutCommand(rawToken), cancellationToken);
 
         response.Cookies.Delete(RefreshCookieName, BuildCookieOptions(request));
+        DeleteStreamCookie(request, response);
         return Results.NoContent();
     }
 
@@ -172,6 +173,7 @@ public static class AuthEndpoints
     {
         var result = await sender.Send(new DeleteMyAccountCommand(), cancellationToken);
         response.Cookies.Delete(RefreshCookieName, BuildCookieOptions(request));
+        DeleteStreamCookie(request, response);
         return result.ToHttpResult();
     }
 
@@ -195,6 +197,20 @@ public static class AuthEndpoints
             SameSite = SameSiteMode.Strict,
             Path = "/api/auth",
         };
+
+    /// <summary>Гасит stream-cookie (tw_stream, Path=/api) — иначе после выхода эфир можно смотреть
+    /// по прямой ссылке ещё до истечения токена.</summary>
+    private static void DeleteStreamCookie(HttpRequest request, HttpResponse response) =>
+        response.Cookies.Delete(
+            "tw_stream",
+            new CookieOptions
+            {
+                HttpOnly = true,
+                Secure = request.IsHttps,
+                SameSite = SameSiteMode.Strict,
+                Path = "/api",
+            }
+        );
 }
 
 public sealed record AuthResponseDto(