feat: add MeshPort overlay networking, item actions window, and AVA2 client enhancements

- add MeshPort peer-to-peer overlay networking SDK, C++ integration, and Python bindings
- add item actions quick use/split/delete/lock overlay window (mt_item_actions)
- add shop name range and NPC name visibility settings to system display options
- support battlepass ticket activation and month validation in mt_battlepass
- support boss tracking teleport destination button in mt_bosses
- support asynchronous account registration cancellation and pending login cancellation
- update AVA2 item conversion for attr lock scrolls and battlepass tickets
- update .gitignore for local build outputs and caches

src/port/EterLib/NetStream.cpp

@@ -1,5 +1,8 @@
 #include "StdAfx.h"
 #include "NetStream.h"
+#ifdef MT_HAS_MESHPORT
+#include "transport.h" // PORT: application-only mesh transport, including account/warp/mark sockets.
+#endif
 //#include "eterCrypt.h"
 
 #ifndef _IMPROVED_PACKET_ENCRYPTION_
@@ -288,6 +291,19 @@ void CNetworkStream::Process()
 	if (m_sock == INVALID_SOCKET)
 		return;
 
+#ifdef MT_HAS_MESHPORT
+	if (!m_isOnline && mt::meshport::pending(m_sock))
+	{
+		const int state = mt::meshport::poll_socket(m_sock);
+		if (state < 0 || time(NULL) > m_connectLimitTime)
+		{
+			Clear();
+			OnConnectFailure();
+			return;
+		}
+		if (state == 0) return;
+	}
+#endif
 	fd_set fdsRecv;
 	fd_set fdsSend;
 
@@ -373,6 +389,9 @@ void CNetworkStream::Clear()
 	m_cipher.CleanUp();
 #endif
 
+#ifdef MT_HAS_MESHPORT
+	mt::meshport::forget_socket(m_sock); // PORT: discard partial SOCKS negotiation before fd reuse.
+#endif
 	closesocket(m_sock);
 	m_sock = INVALID_SOCKET;
 
@@ -416,7 +435,12 @@ bool CNetworkStream::Connect(const CNetworkAddress& c_rkNetAddr, int limitSec)
 	DWORD arg = 1;
 	ioctlsocket(m_sock, FIONBIO, &arg);	// Non-blocking mode
 
-	if (connect(m_sock, (PSOCKADDR)&m_addr, m_addr.GetSize()) == SOCKET_ERROR)
+#ifdef MT_HAS_MESHPORT
+	const int connectResult = mt::meshport::connect_socket(m_sock, static_cast<const SOCKADDR_IN&>(m_addr), this);
+#else
+	const int connectResult = connect(m_sock, (PSOCKADDR)&m_addr, m_addr.GetSize());
+#endif
+	if (connectResult == SOCKET_ERROR)
 	{
 		int error = WSAGetLastError();
 
@@ -430,6 +454,9 @@ bool CNetworkStream::Connect(const CNetworkAddress& c_rkNetAddr, int limitSec)
 		}
 	}
 
+#ifdef MT_HAS_MESHPORT
+	if (mt::meshport::pending(m_sock) && limitSec < 75) limitSec = 75; // PORT: DHCP/routes plus remote SOCKS connect.
+#endif
 	m_connectLimitTime = time(NULL) + limitSec;
 	return true;	
 }