Add advanced sync logging for debugging host-client sync issues

- Add LogSync() helper method in Main.cs for consistent sync logging
- Log all packet send/receive events in PacketHandler and Packet classes
- Add detailed building placement logging in WorldPlace.cs (all properties, final state)
- Add building state update logging in BuildingStatePacket.cs
- Add building state send logging in BuildingStateManager.cs

All sync logs are prefixed with [SYNC] for easy filtering.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Main.cs

@@ -56,6 +56,12 @@ namespace KCM
         public static Dictionary<ushort, string> clientSteamIds = new Dictionary<ushort, string>();
         public static Dictionary<Guid, BuildingStatePacket> pendingBuildingStatePackets = new Dictionary<Guid, BuildingStatePacket>();
 
+        // Advanced sync logging helper
+        public static void LogSync(string message)
+        {
+            helper.Log($"[SYNC] {message}");
+        }
+
         public static KCPlayer GetPlayerByClientID(ushort clientId)
         {
             return kCPlayers[clientSteamIds[clientId]];