Import december-2020-12-18 from private repo (scrubbed 2026-05-27)

Targets Rec Room 2020.12.18 client.

Re-import after adding:
- DorkNet.ClientMod/dorknet-clientmod.json.template — config schema
  the launcher's manifest-driven patcher renders into UserData/.
- tools/build-patcher-zip.ps1 — produces the dorknet-clientpatch-{key}.zip
  Release asset the launcher fetches.
- .github/workflows/release.yml — auto-publishes both Release assets
  on v1-december-* tag push.

Scrubbed via maintainer-side scrub-for-public.ps1: same drop rules as
the prior import, plus build-patcher-zip.ps1 added to the tools/
allow-list so it survives the scrub.

DorkNet.Server/Data/Entities/RoomKeyEntity.cs

@@ -0,0 +1,31 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace DorkNet.Server.Data.Entities;
+
+/// <summary>
+/// Paid room access key authored by a room owner/co-owner. The watch
+/// displays these in the room-key editor and purchase flow.
+/// </summary>
+public class RoomKeyEntity
+{
+    public long Id { get; set; }
+    [MaxLength(64)] public string ReplicationId { get; set; } = Guid.NewGuid().ToString("D");
+    public long RoomId { get; set; }
+    public long CreatorPlayerId { get; set; }
+    [MaxLength(40)] public string Name { get; set; } = string.Empty;
+    [MaxLength(174)] public string Description { get; set; } = string.Empty;
+    public int Price { get; set; }
+    public bool IsDeleted { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+/// <summary>One purchased room key per player.</summary>
+public class RoomKeyPurchaseEntity
+{
+    public long Id { get; set; }
+    public long RoomKeyId { get; set; }
+    public long PlayerId { get; set; }
+    public int PaidPrice { get; set; }
+    public DateTime PurchasedAt { get; set; } = DateTime.UtcNow;
+}