refactor(backend): replace coravel with hangfire for background jobs

for *some reason*, coravel locks a persistent job queue behind a
paywall. this means that if the server ever crashes, all pending jobs
are lost. this is... not good, so we're switching to hangfire for that
instead.

coravel is still used for emails, though.

BREAKING CHANGE: Foxnouns.NET now requires Redis to work. the EFCore
storage for hangfire doesn't work well enough, unfortunately.

Foxnouns.Backend/Controllers/ExportsController.cs

@@ -12,7 +12,6 @@
 //
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
-using Coravel.Queuing.Interfaces;
 using Foxnouns.Backend.Database;
 using Foxnouns.Backend.Database.Models;
 using Foxnouns.Backend.Dto;
@@ -28,13 +27,8 @@ namespace Foxnouns.Backend.Controllers;
 [Authorize("identify")]
 [Limit(UsableByDeletedUsers = true)]
 [ApiExplorerSettings(IgnoreApi = true)]
-public class ExportsController(
-    ILogger logger,
-    Config config,
-    IClock clock,
-    DatabaseContext db,
-    IQueue queue
-) : ApiControllerBase
+public class ExportsController(ILogger logger, Config config, IClock clock, DatabaseContext db)
+    : ApiControllerBase
 {
     private static readonly Duration MinimumTimeBetween = Duration.FromDays(1);
     private readonly ILogger _logger = logger.ForContext<ExportsController>();
@@ -80,10 +74,7 @@ public class ExportsController(
             throw new ApiError.BadRequest("You can't request a new data export so soon.");
         }
 
-        queue.QueueInvocableWithPayload<CreateDataExportInvocable, CreateDataExportPayload>(
-            new CreateDataExportPayload(CurrentUser.Id)
-        );
-
+        CreateDataExportJob.Enqueue(CurrentUser.Id);
         return NoContent();
     }
 }