feat: store local ID assigned by domain server for packet sourcing

src/OverteClient.cpp

@@ -729,6 +729,9 @@ void OverteClient::handleDomainListReply(const char* data, size_t len) {
     uint16_t localID = ntohs(*reinterpret_cast<const uint16_t*>(data + offset));
     offset += 2;
     
+    // Store our local ID for use in sourced packets
+    m_localID = localID;
+    
     std::cout << "[OverteClient] Local ID: " << localID << std::endl;
     
     // Read permissions (32-bit)

src/OverteClient.hpp

@@ -96,6 +96,7 @@ private:
 	std::string m_sessionUUID; // Our client session UUID
 	std::string m_username;     // Domain account username (for future signature-based auth)
 	std::uint32_t m_sequenceNumber{0};  // Packet sequence number for NLPacket protocol
+	std::uint16_t m_localID{0};         // Local ID assigned by domain server
 
 	// Very small in-process world state for testing
 	std::unordered_map<std::uint64_t, OverteEntity> m_entities;