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/Controllers/API/Config/V1/ConfigController.cs

@@ -0,0 +1,79 @@
+using Microsoft.AspNetCore.Mvc;
+using DorkNet.Server.Services;
+
+namespace DorkNet.Server.Controllers.API.Config.V1;
+
+[ApiController]
+[Route("api/[controller]/v1")]
+public class ConfigController(ConfigService configService) : ControllerBase
+{
+    [HttpGet("motd")]
+    public ActionResult<string> GetMotd()
+    {
+        var cfg = configService.GetConfig($"{Request.Scheme}://{Request.Host}");
+        return Ok(cfg.MessageOfTheDay);
+    }
+
+    [HttpGet("objectives")]
+    public ActionResult<List<object>> GetObjectives() => Ok(new List<object>());
+
+    // AmplitudeConfig.Deserialize expects key "AmplitudeKey"
+    [HttpGet("amplitude")]
+    public ActionResult<object> GetAmplitude() => Ok(new { AmplitudeKey = string.Empty });
+
+    /// <summary>GET <c>api/config/v1/freegiftbutton</c> — the
+    /// 2020.12 client deserializes this endpoint as a raw Boolean.
+    /// This server does not run the timed free-gift campaign, so the
+    /// button is hidden.</summary>
+    [HttpGet("freegiftbutton")]
+    public IActionResult FreeGiftButton() => Content("false", "application/json");
+
+    /// <summary>
+    /// `Config.GetCohortNUXButtonConfigs(cohortId)` — returns the four
+    /// "What would you like to do first?" buttons shown in the OOBE
+    /// (RegistrationSceneNUX → ChooseCohortScreen). Each button maps to
+    /// a room the new player can teleport into.
+    ///
+    /// Wire shape per CohortNUXButtonConfig (TypeDefIndex 11516) — list of:
+    ///   Version          (int)
+    ///   ButtonNumber     (int, 0..3 → Button1..Button4)
+    ///   Override         (int, 0=None, 1=Hotlist, 2=Custom)
+    ///   CustomRoomName   (string)
+    ///   CustomTitle      (string)
+    ///   DefaultRoomName  (string)
+    ///   DefaultTitle     (string)
+    ///
+    /// The screen picks `CustomRoomName` if Override=Custom, else the
+    /// `DefaultRoomName` (resolved by Rooms.GetByName). For simplicity all
+    /// four use Override=None and route to Rec Room Original rooms we
+    /// already seeded — picking the most newcomer-friendly ones.
+    /// </summary>
+    [HttpGet("cohortnux/{cohortId:int}")]
+    public IActionResult GetCohortNux(int cohortId) => Ok(new[]
+    {
+        new {
+            Version = 1, ButtonNumber = 0, Override = 0,
+            CustomRoomName = "", CustomTitle = "",
+            DefaultRoomName = "RecCenter",
+            DefaultTitle = "Hang out at the Rec Center",
+        },
+        new {
+            Version = 1, ButtonNumber = 1, Override = 0,
+            CustomRoomName = "", CustomTitle = "",
+            DefaultRoomName = "Paintball",
+            DefaultTitle = "Play Paintball",
+        },
+        new {
+            Version = 1, ButtonNumber = 2, Override = 0,
+            CustomRoomName = "", CustomTitle = "",
+            DefaultRoomName = "Dodgeball",
+            DefaultTitle = "Play Dodgeball",
+        },
+        new {
+            Version = 1, ButtonNumber = 3, Override = 0,
+            CustomRoomName = "", CustomTitle = "",
+            DefaultRoomName = "GoldenTrophy",
+            DefaultTitle = "Quest for the Golden Trophy",
+        },
+    });
+}