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/PlayerInventoryEntity.cs

@@ -0,0 +1,33 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace DorkNet.Server.Data.Entities;
+
+/// <summary>
+/// One row per (player, item) pair. Backs both the
+/// <c>/api/equipment/v2/getUnlocked</c> and
+/// <c>/api/consumables/v1/getUnlocked</c> endpoints — the type comes
+/// from the joined <see cref="StoreItemEntity.Category"/>.
+///
+/// For equipment, <see cref="Quantity"/> is always 1 and
+/// <see cref="IsActive"/> tracks whether it's equipped. For
+/// consumables, <see cref="Quantity"/> is the stack size and
+/// <see cref="IsActive"/> tracks whether the player has it favourited /
+/// quick-equipped on the watch.
+/// </summary>
+public class PlayerInventoryEntity
+{
+    public long Id { get; set; }
+    public long PlayerId { get; set; }
+
+    /// <summary>FK by string to <see cref="StoreItemEntity.Slug"/>.
+    /// Stored as a string rather than an int FK because a player can
+    /// be granted items that aren't in the live store (admin-gifted,
+    /// legacy retired items, etc.).</summary>
+    [MaxLength(64)]
+    public string ItemSlug { get; set; } = string.Empty;
+
+    public int Quantity { get; set; } = 1;
+    public bool IsActive { get; set; } = false;
+
+    public DateTime AcquiredAt { get; set; } = DateTime.UtcNow;
+}