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/ServiceUrlsController.cs

@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.Mvc;
+using DorkNet.Server.Services;
+
+namespace DorkNet.Server.Controllers.API.Config.V1;
+
+/// <summary>
+/// Returns the full Rec Room service URL map. Some builds fetch this standalone
+/// at /api/config/v1/services to discover where the other subdomains live.
+/// Apex comes from <see cref="DomainConfig"/> (DORKNET_DOMAIN), so a single
+/// env var controls every URL emitted.
+/// </summary>
+[ApiController]
+[Route("api/config/v1")]
+public class ServiceUrlsController(DomainConfig domain) : ControllerBase
+{
+    [HttpGet("services")]
+    public ActionResult<Dictionary<string, string>> Get()
+        => Ok(ConfigService.BuildServiceUrlMap(domain.Apex));
+}