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/RootController.cs

@@ -0,0 +1,31 @@
+using Microsoft.AspNetCore.Mvc;
+using DorkNet.Server.Services;
+
+namespace DorkNet.Server.Controllers;
+
+[ApiController]
+public class RootController(ConfigService configService) : ControllerBase
+{
+    // Legacy MOTD for pre-Dorm Room builds
+    [HttpGet("motd")]
+    public ActionResult<string> GetMotd()
+    {
+        var cfg = configService.GetConfig($"{Request.Scheme}://{Request.Host}");
+        return Ok(cfg.MessageOfTheDay);
+    }
+
+    // Serve images from data/images/
+    [HttpGet("img/{name}")]
+    public ActionResult GetImage(string name)
+    {
+        var safeFileName = Path.GetFileName(name); // prevent path traversal
+        var path = Path.Combine(AppContext.BaseDirectory, "data", "images", safeFileName);
+
+        if (!System.IO.File.Exists(path))
+            return NotFound();
+
+        var ext = Path.GetExtension(safeFileName).ToLowerInvariant();
+        var contentType = ext == ".png" ? "image/png" : "image/jpeg";
+        return PhysicalFile(path, contentType);
+    }
+}