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.Models/Auth/CachedLogin.cs

@@ -0,0 +1,36 @@
+using System.Text.Json.Serialization;
+
+namespace DorkNet.Models.Auth;
+
+/// <summary>
+/// Login.CachedLogin — dump.cs:578388, Deserialize at RVA 0x1447BD0.
+///
+/// Verified by disassembly: reads platform, platformId, accountId,
+/// lastLoginTime (DateTime), requirePassword (default false). The Account
+/// field on the C# class is NOT read from the JSON dict — it is set via
+/// SetAccount(Account) after the fact, so the JSON shape doesn't need it.
+///
+/// Returned by:
+///   GET auth.rec.net/cachedlogin/forplatformid/{platform}/{platformId}
+///   GET api.rec.net/api/platformlogin/cached
+///   GET accounts.rec.net/account/v1/savedlogins
+/// as a List&lt;CachedLogin&gt;. Empty list = no remembered accounts.
+/// </summary>
+public class CachedLogin
+{
+    // PlatformManager.PlatformType (int)
+    [JsonPropertyName("platform")]
+    public int Platform { get; set; }
+
+    [JsonPropertyName("platformId")]
+    public string PlatformId { get; set; } = string.Empty;
+
+    [JsonPropertyName("accountId")]
+    public int AccountId { get; set; }
+
+    [JsonPropertyName("lastLoginTime")]
+    public DateTime LastLoginTime { get; set; } = DateTime.UtcNow;
+
+    [JsonPropertyName("requirePassword")]
+    public bool RequirePassword { get; set; } = false;
+}