feat(import): import owned card collection with unknown-card skip

Extends POST /admin/import_viewer to accept owned_cards (snapshot full-replace).
Unknown card_ids are skipped, counted in skipped_card_count on the response, and
logged server-side. Count is clamped to OwnedCardEntry.MaxCopies (3). Also injects
ILogger into AdminController and adds Cards/Items/Decks to the viewer reload graph.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Admin/ImportViewerResponse.cs

@@ -7,4 +7,5 @@ public class ImportViewerResponse
     [JsonPropertyName("viewer_id")] public long ViewerId { get; set; }
     [JsonPropertyName("short_udid")] public long ShortUdid { get; set; }
     [JsonPropertyName("was_created")] public bool WasCreated { get; set; }
+    [JsonPropertyName("skipped_card_count")] public int SkippedCardCount { get; set; }
 }