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/ProgressionEvents/ProgressionEventsController.cs

@@ -226,6 +226,11 @@ public class ProgressionEventsController(
             IsValid = true,
             SupportsCurrentPlatform = true,
         };
+        // The sentinel key needs the generated gift id, so this takes two
+        // saves — but they must commit together: a crash between them would
+        // leave a gift with no sentinel, and the next Collect would mint the
+        // reward a second time.
+        await using var tx = await db.Database.BeginTransactionAsync();
         db.GiftPackages.Add(gift);
         await db.SaveChangesAsync();
 
@@ -237,6 +242,7 @@ public class ProgressionEventsController(
             ClearedAt = DateTime.UtcNow,
         });
         await db.SaveChangesAsync();
+        await tx.CommitAsync();
 
         return Ok(global::DorkNet.Server.Controllers.API.Avatar.V2.AvatarGiftsController.ToWire(gift));
     }