Import march-2020-03-10 from private repo (scrubbed 2026-05-27)

Targets Rec Room 2020.03.10 client (also serves 2020.03.06).

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 dorknet-clientpatch-{key}.zip
  for v1-march-* Release uploads.
- .github/workflows/release.yml — on tag push publishes both
  dorknet-server-march_2020_03_10-win-x64.zip and
  dorknet-clientpatch-march_2020_03_10.zip as Release assets.

Same scrub rules as december; tools/build-patcher-zip.ps1 added to
the maintainer-side allow-list so it survives.

DorkNet.Server/Data/Entities/LeaderboardChannelMetaEntity.cs

@@ -0,0 +1,40 @@
+namespace DorkNet.Server.Data.Entities;
+
+/// <summary>
+/// Admin-curated metadata for a leaderboard <c>StatChannel</c> id. The
+/// 2020 watch reports raw integer channel ids via
+/// <c>POST api/Leaderboard/v1/SetStats</c>; this table lets admins map
+/// each channel to a specific room (so the room detail page can list
+/// "its" leaderboards) and a human-readable name + ordering hint. Rows
+/// here override the hardcoded <c>AdminController.KnownStatChannels</c>
+/// fallback. Channels with no row stay listed as "Channel N".
+///
+/// One channel id, one row. Repeated <c>SetStats</c> calls for the same
+/// channel from any room write to that channel's value rows; the meta
+/// row only changes when an admin renames or re-maps it.
+/// </summary>
+public class LeaderboardChannelMetaEntity
+{
+    /// <summary>Same int the watch reports for this channel. Primary
+    /// key — there's only ever one meta row per channel.</summary>
+    public int Channel { get; set; }
+
+    /// <summary>Room this channel "belongs to" for the per-room detail
+    /// view. 0 = global / unscoped (e.g. cross-room player progression
+    /// counters). The same room can own many channels (e.g. Stunt
+    /// Runner has one channel per course).</summary>
+    public long RoomId { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>When true, a lower stored value is a better score (race
+    /// times, lap times, etc.). The list endpoint sorts ascending.</summary>
+    public bool LowerIsBetter { get; set; }
+
+    /// <summary>UI hint: "count" (default), "time-ms" for elapsed-time
+    /// channels, "score" for points. The SPA formats accordingly.</summary>
+    public string ValueFormat { get; set; } = "count";
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}