feat: implement non-blocking UDP packet reception in OverteClient::poll method

src/OverteClient.cpp

@@ -369,6 +369,8 @@ void OverteClient::poll() {
 
     // Poll domain UDP socket for domain-level packets
     if (m_udpReady && m_udpFd != -1) {
+        // Read ALL available packets (non-blocking socket)
+        while (true) {
             char buf[1500];
             sockaddr_storage from{}; socklen_t fromlen = sizeof(from);
             ssize_t r = ::recvfrom(m_udpFd, buf, sizeof(buf), 0, reinterpret_cast<sockaddr*>(&from), &fromlen);
@@ -390,12 +392,22 @@ void OverteClient::poll() {
                 }
                 std::cout << std::endl;
                 parseDomainPacket(buf, static_cast<size_t>(r));
-        } else if (r < 0 && errno != EWOULDBLOCK && errno != EAGAIN) {
+            } else if (r < 0) {
-            // Only log errors that aren't "would block"
+                if (errno == EWOULDBLOCK || errno == EAGAIN) {
+                    // No more packets available
+                    break;
+                } else {
+                    // Real error
                     static int errorCount = 0;
                     if (++errorCount <= 3) {
                         std::cerr << "[OverteClient] UDP recv error: " << strerror(errno) << std::endl;
                     }
+                    break;
+                }
+            } else {
+                // r == 0, connection closed (shouldn't happen with UDP)
+                break;
+            }
         }
         
         // Send periodic ping to domain to keep connection alive