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/GameConfigurations/GameConfigurationsController.cs

@@ -0,0 +1,15 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace DorkNet.Server.Controllers.API.GameConfigurations;
+
+[ApiController]
+public class GameConfigurationsController : ControllerBase
+{
+    // Actual path used by the 2020 build
+    [HttpGet("api/gameconfigs/v1/all")]
+    [HttpGet("api/gameconfigs/v1")]
+    // Legacy path we originally assumed
+    [HttpGet("api/gameconfigurations/v1/all")]
+    [HttpGet("api/gameconfigurations/v1")]
+    public ActionResult<List<object>> GetAll() => Ok(new List<object>());
+}