feat(data): add ImportTickets prime kind, ticket fallback list and import prompt

src/ClaudeDo.Data/Models/AppSettingsEntity.cs

@@ -83,4 +83,8 @@ public sealed class AppSettingsEntity
     // 4 = two full wait/merge cycles, the long-standing default. Raise it for a run meant to keep
     // going for hours. It exists to bound runaway handoff loops, so it must stay >= 1.
     public int ListHandlerMaxHandoffs { get; set; } = 4;
+
+    // List that receives imported ticket items Claude could not place (import_ticket without a
+    // list). Null = such items are skipped. No FK: a deleted list simply reads as unset at import.
+    public string? TicketFallbackListId { get; set; }
 }