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/DormStateEntity.cs

@@ -0,0 +1,31 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace DorkNet.Server.Data.Entities;
+
+/// <summary>
+/// Per-player dorm state. Decouples each player's dorm save bytes from
+/// the canonical RoomEntity row at <c>RoomId=1</c> (which is shared
+/// across every dorm visit and would otherwise leak one player's save
+/// into every other player's dorm).
+///
+/// One row per account that has ever entered their dorm. Created on the
+/// first <c>/api/rooms/v4/details/1</c> hit and updated whenever the
+/// player saves their dorm via Maker Pen.
+/// </summary>
+public class DormStateEntity
+{
+    /// <summary>The owning account id. Primary key — one dorm state row
+    /// per player.</summary>
+    [Key]
+    public long PlayerId { get; set; }
+
+    /// <summary>Blob name for the player's most recent dorm save. Format
+    /// <c>dorm_p&lt;accountId&gt;_v&lt;n&gt;.dat</c>; matches the
+    /// <see cref="RoomDataBlobEntity.BlobName"/> stored when the upload
+    /// landed. Empty string before the player has saved.</summary>
+    [MaxLength(128)]
+    public string CurrentDataBlobName { get; set; } = string.Empty;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}