feat: Add metro transit, gadgets, shop, social apps, and traffic models checkpoint

Ananta.Server/Ananta.Core/Protocol/Client4229938/MethodId.cs

@@ -3137,6 +3137,8 @@ internal static class MethodId
     internal const uint SyncGadgetAOIAddAndRemove = 68169646;
     internal const uint SyncTurnToPosPosition = 68169791;
     internal const uint SyncAttractPointPosition = 68172618;
+    // PHANTOM ID — not in the 4229938 client's method table (dump + RPCMethodIdToName.lua).
+    // The real Aether NPC remove is SyncAetherAINpcRemove = 68332284. Do not send this.
     internal const uint SyncAetherAIVehicleNpcRemove = 68173578;
     internal const uint SyncPlateRemoveList = 68174318;
     internal const uint SyncFightGamePlayerLeave = 68176524;
@@ -3444,6 +3446,9 @@ internal static class MethodId
     internal const uint SyncDebugPlotBT = 68568004;
     internal const uint IGameSceneToClient_SyncDiceRoundSettle = 68568673;
     internal const uint IGameSceneToClient_SyncLoadChefNpcIds = 68570971;
+    // PHANTOM ID — there is NO batch vehicle AddDatas in the 4229938 client (its method table
+    // only has the single SyncAetherAIVehicleAddData = 68916691). Batches sent here were
+    // silently dropped (cars never rendered). Do not send this.
     internal const uint SyncAetherAIVehicleAddDatas = 68571034;
     internal const uint IGameSceneToClient_SyncMahjongReadyStart = 68572064;
     internal const uint SyncRemoveClientGameplayTag = 68572571;
@@ -4560,6 +4565,10 @@ internal static class MethodId
     internal const uint ReportCreationVehicleEnterOrLeaves = 67004409;
     internal const uint AskControlPowerHoldEnemyFallGround = 67043294;
 
+    // Aether client-driven traffic — intersection period update (the only Aether sync id
+    // missing from the original set; all others already exist above with verified values).
+    internal const uint SyncAetherAIIntersectionUpdateData = 68819947;
+
     internal static void RegisterKnownNames(RpcRouter router)
     {
         foreach (var field in typeof(MethodId).GetFields(BindingFlags.Static | BindingFlags.NonPublic))