fix(worker): fix Bandel ticket sync and reactivate the integration

The status PATCH needs statusName alongside statusId or the API 400s,
so every write-back had been silently failing. The board's flat
assigneeName is null on every live ticket; the real assignee list is
ticketAssignees[]. Import now also picks up In Bearbeitung tickets,
not just Offen ones.

Both issues are live-verified against the real API, so the feature
flag flips back on.

src/ClaudeDo.Worker/Tickets/TicketDtos.cs

@@ -16,6 +16,11 @@ public sealed record TicketIdentity(
     [property: JsonPropertyName("scopes")] IReadOnlyList<string> Scopes);
 
 /// Ein Board-Item (Ausschnitt aus GetTicketSummaryDto — nur was der Import braucht).
+/// ⚠️ <see cref="AssigneeId"/>/<see cref="AssigneeName"/> sind live durchgehend null (geprüft über
+/// alle 63 Tickets der Abteilung Entwicklung, 2026-09-01). Die echten Zuweisungen stehen in
+/// <see cref="TicketAssignees"/>; nur dessen <c>assigneeName</c> hat dasselbe Format wie
+/// <see cref="TicketIdentity.UserName"/> (<c>mika.kuns</c>). <c>personInChargeName</c> wäre die
+/// falsche Quelle — dort steht mal der Login, mal der Anzeigename ("Mika Kuns").
 public sealed record TicketBoardItem(
     [property: JsonPropertyName("id")] int Id,
     [property: JsonPropertyName("title")] string Title,
@@ -23,6 +28,11 @@ public sealed record TicketBoardItem(
     [property: JsonPropertyName("statusId")] int StatusId,
     [property: JsonPropertyName("statusName")] string? StatusName,
     [property: JsonPropertyName("assigneeID")] int? AssigneeId,
+    [property: JsonPropertyName("assigneeName")] string? AssigneeName,
+    [property: JsonPropertyName("ticketAssignees")] IReadOnlyList<TicketAssignee>? TicketAssignees = null);
+
+public sealed record TicketAssignee(
+    [property: JsonPropertyName("assigneeId")] int AssigneeId,
     [property: JsonPropertyName("assigneeName")] string? AssigneeName);
 
 /// GET /api/Navigation/sidebar — Abteilung mit ihren Projekten.