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/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));
+}