fix: address the 15 CodeRabbit findings from the wire-audit review

Security:
- roomcode PUT now requires instance ownership (any player could plant
  or relocate codes on foreign private instances)
- /platformid/{accountId} requires auth (anonymous Steam/Oculus id
  enumeration oracle)
- request tracing no longer captures successful /thread bodies by
  default (chat messages landed unredacted in logs); opt in via
  Trace__SuccessBodyPaths
- anonymous action-link renewal clamped to 720h per consume

Data integrity:
- buyPurchaseReminder upserts its objective sentinel (second purchase
  threw UNIQUE after the wallet was debited)
- progression reward gift + idempotency sentinel commit in one
  transaction (crash between them double-minted the reward)
- ClubPermissionsGalleryAndModeration migration defaults corrected to
  the entity contract (CommentsJson '[]', ClubChatEnabled true); new
  one-shot ClubChatDefaultRepair migration fixes databases that
  applied the wrong defaults; bootstrap repairs '' CommentsJson rows
- admin subroom-maxplayers audit entry commits with the mutation
- account purge covers CustomAvatarItems (ownership deleted, created
  items reassigned to the system account)
- duplicate photo reports ignored while one is unresolved

Stability:
- bootstrap only swallows the expected duplicate-column error; locked
  databases and schema failures now fail startup instead of the first
  endpoint
- clone blob write failure degrades to an empty sub-room instead of a
  500 after the clone row committed
- resumed photo-feed cursor stamped DateTimeKind.Utc (Npgsql rejects
  Unspecified for timestamptz)
- unreadcounts queries per requested room instead of materialising the
  whole comment keyspace

Tests:
- destroys-the-probe-session template guard is case-insensitive

74/74 tests pass.

DorkNet.Server/Controllers/API/Rooms/V2/RoomsModerationController.cs

@@ -1642,7 +1642,21 @@ public class RoomsModerationController(
 
         var newBlob = CloneBlobName(cloneId, orderIndex);
         var (dstBucket, dstKey) = BlobRouter.Route(newBlob);
-        await storage.PutAsync(dstBucket, dstKey, bytes, "application/octet-stream");
+        try
+        {
+            await storage.PutAsync(dstBucket, dstKey, bytes, "application/octet-stream");
+        }
+        catch (Exception ex)
+        {
+            // Same reasoning as the read side: the clone row is already
+            // committed, so a storage outage must degrade to an empty
+            // sub-room, not a 500 that leaves a failed-looking clone still
+            // pointing at the source's data.
+            logger.LogWarning(ex,
+                "[room-clone] could not write blob {Blob}; room {Room} sub-room {Sub} starts empty",
+                newBlob, cloneId, orderIndex);
+            return null;
+        }
 
         db.RoomDataBlobs.Add(new RoomDataBlobEntity
         {