Fix auth protocol to match real WoW 3.3.5a client format

Three critical bugs fixed:
- LOGON_CHALLENGE request: set protocol byte to 0x03 (was 0x00) and
  reverse FourCC strings (game/platform/os/locale) to match real client
- Response parsers: remove double-read of opcode byte that shifted all
  field reads by one, preventing successful auth with real servers
- LOGON_PROOF response sizes: success=32 bytes, failure=4 bytes to match
  TrinityCore/AzerothCore format

Also adds missing auth result codes (0x13-0x20, 0xFF) including
IGR_WITHOUT_BNET (0x17) which Warmane was returning.

src/network/tcp_socket.cpp

@@ -224,14 +224,14 @@ size_t TCPSocket::getExpectedPacketSize(uint8_t opcode) {
             return 0;  // Need more data to determine
 
         case 0x01:  // LOGON_PROOF response
-            // opcode(1) + status(1) + M2(20) = 22 bytes on success
-            // opcode(1) + status(1) = 2 bytes on failure
+            // Success: opcode(1) + status(1) + M2(20) + accountFlags(4) + surveyId(4) + loginFlags(2) = 32
+            // Failure: opcode(1) + status(1) + padding(2) = 4
             if (receiveBuffer.size() >= 2) {
                 uint8_t status = receiveBuffer[1];
                 if (status == 0x00) {
-                    return 22;  // Success
+                    return 32;  // Success
                 } else {
-                    return 2;   // Failure
+                    return 4;   // Failure
                 }
             }
             return 0;  // Need more data