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/appsettings.json

@@ -0,0 +1,33 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "Jwt": {
+    "Secret": "CHANGE_ME_TO_A_LONG_RANDOM_SECRET_AT_LEAST_64_CHARACTERS_LONG_FOR_SECURITY_PURPOSES"
+  },
+  "Photon": {
+    "AppId": "<your-photon-realtime-app-id>",
+    "VoiceAppId": "<your-photon-voice-app-id>",
+    "CloudRegion": "eu"
+  },
+  "Server": {
+    "MOTD": "Welcome to the Rec Room private server!",
+    "CommunityBoardMessage": "Bacon Stinks",
+    "CommunityBoardMoreInfoUrl": "",
+    "PhotonRoomPrefix": "DorkNet"
+  },
+  "DorkNet": {
+    "_comment_SupportedVersions": "Per-deployment allow-list. Requests whose X-DorkNet-Version header isn't in this set get a 426 Upgrade Required. To accept multiple client builds add their keys here.",
+    "SupportedVersions": [ "december_2020_12_18" ],
+    "_comment_DefaultClientVersion": "Fallback for requests without an X-DorkNet-Version header — the transition path while not every shipped client mod yet stamps the header. Set to '' (empty) once everyone's caught up to also reject headerless calls.",
+    "DefaultClientVersion": "december_2020_12_18",
+    "_comment_BuildIdToVersionKey": "Maps the raw build identifier the 2020 watch sends to /api/versioncheck/v4?v={buildId} (read from KMJJGELKNAP.MCFMPCNNEBH, e.g. '20201210') to our internal ClientVersion.Key. Builds not listed here get UpdateRequired and the watch shows its native dialog. Add a new build by listing its raw ID + matching version-plugin key.",
+    "BuildIdToVersionKey": {
+      "20201210": "december_2020_12_18"
+    }
+  }
+}