feat: add print_server_protocol tool to display server protocol signatures in hex and base64

tools/print_server_protocol.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <iomanip>
+#include "../third_party/overte-src/libraries/networking/src/udt/PacketHeaders.h"
+
+int main() {
+    QByteArray sig = protocolVersionsSignature();
+    
+    std::cout << "Server protocol signature (hex): ";
+    for (int i = 0; i < sig.size(); ++i) {
+        std::cout << std::hex << std::setw(2) << std::setfill('0') 
+                  << (int)(unsigned char)sig[i];
+    }
+    std::cout << std::endl;
+    
+    std::cout << "Server protocol signature (base64): " 
+              << protocolVersionsSignatureBase64().toStdString() << std::endl;
+    
+    return 0;
+}